Polyurethane-based polyurethane foam is indispensable for sealing cracks, holes, joints, heat and sound insulation, as well as for gluing various surfaces. It is not used when working with surfaces made of polypropylene, polyethylene, Teflon, silicone and wax. To understand how to use polyurethane foam, it is enough to understand the rules.
An assortment to choose from
Two types of polyurethane foam - semi-professional (household) and professional (pistol). Depending on the temperature conditions, winter, summer or off-season ones are selected.
For a small amount of simple work, a relatively cheap household one is suitable. It is sold together with a plastic tube, the output volume is smaller and is intended for one-time use, since after opening the container its contents dry out within 24 hours.
More expensive professional mounting mixture is sold complete with a special gun. It is designed for reusable use and precisely regulates the supplied volume of sealant.
High-quality pistols are made of metal and are completely dismountable. By rotating the adjusting screw located on the handle clockwise, the thickness of the supplied jet is reduced, and counterclockwise, it is increased.
Design of a special gun for polyurethane foam This point is important because optimal diameter one applied layer after hardening is in the region of 3 cm. If a larger space is filled, then the sealant is applied in two or three layers with breaks for each of the applied layers to dry.
They take into account the fact that professional sealant shrinks less than household sealant .
Preparatory stage
In order for the use of mounting sealant to have an effect, carry out preliminary preparation which includes the following:
- Before applying sealant, surfaces are cleaned of dust and debris. If necessary, degrease with acetone or solvent.
- For good interaction of the sealant with the surface, the latter is moistened abundantly, but at the same time make sure that no drops of moisture form on the treated surface.
- Adapt the temperature of the cylinder to the temperature of the room in which the finishing is carried out. To speed up this process, if the balloon is brought from the cold, place it in warm water for an hour and a half.
- Before use, shake the container vigorously 20-30 times to mix the components of the sealant. Then remove the protective cap and screw the tube onto it, and if it is a professional composition, screw the cylinder to the gun. Make sure that during installation the tube or nozzle of the gun is not facing towards people nearby.
- Wear a work suit, protective gloves and goggles.
Preparing to work with polyurethane foam When working with a professional compound, which is used complete with a gun, before starting sealing, adjust the supply of sealant. The stream is adjusted during use by changing the force of pressing on the cap at the base of the tube.
Hardening occurs at temperatures from +5 to +35°C, air humidity of at least 60%. When working in the cold or in a dry space, hardening occurs in the presence of special additives in the composition. In this case, the sealant will harden at an air temperature of -10, or in conditions where air humidity reaches only 35%.
Rules and techniques for working with foam
To understand how to use foam correctly, you need to remember the rules.
The polyurethane foam is applied with measured, smooth movements from left to right and from bottom to top. The openings are not filled completely, but approximately half or one third, depending on the degree of shrinkage.
The length of one applied strip does not exceed 10 centimeters. When working, the cylinder is held vertically with the bottom up. In the case when they perform work on the ceiling, which causes difficulty in complying with the last rule, buy special composition, which works in any position. Another solution to this problem is to extend the nozzle of the gun or the main tube using flexible tubes so that the inverted cylinder does not rest against the ceiling during operation. If necessary, it is better to start work from the ceiling, since the pressure in the cylinder is the maximum possible.
Sealing cracks with a gun When hardening, polyurethane foam begins to exert pressure on adjacent surfaces, which causes their deformation. Therefore, if it is necessary to fill gaps on both sides, as when installing doors and windows, the mounting mixture is used on one side. The other gap is filled with silicone compound.
When applying polyurethane foam to the surfaces to be treated, make sure that the tip of the tube or gun is always inside the foam itself. Periodically remove material adhering to the gun nozzle using a cloth soaked in acetone or solvent. During a long period of operation, the container is shaken periodically. Extension adapters are used to process deep seams.
Shutdown
It is important not only to know how to use polyurethane foam, but also how to complete such work correctly. Wait until the sealant has completely hardened. This usually occurs within 6–12 hours. It is not advisable to touch the mounting mixture in this case, as this will disrupt the structure of the material. After which the excess formations are carefully cut off sharp knife or a hacksaw for metal.
Removing excess foam with a sharp knife Although cured polyurethane foam can withstand temperature changes from -40 to +90°C, it is sensitive to ultraviolet radiation. To neutralize this factor, the excess that is under such influence is covered with a layer of plaster, covered with cement mortar, painted or sewn up with platbands.
The video demonstrates the stages of working with foam and how the gun is cleaned:
After using professional foam, clean the gun inside and out. For this purpose, a special flushing liquid is purchased along with the gun. Any remaining material that gets on your hands is washed off with a solvent. It is better to remove foam residues from surfaces immediately using a sponge soaked in solvent or acetone. If the foam has already hardened, it is removed mechanically.
If these simple rules are applied, self-sealing of all kinds of seams and cracks, insulation of the distribution network and other things will not be special labor even for someone who has never done this before.
This sealing is effective for spaces from 1 to 8 cm, no more. Smaller cracks are sealed with ordinary putty, and for larger ones, additional static materials are laid inside the empty space - polystyrene foam, wooden blocks or brick.
In contact with
The problem is how to competently use polyurethane foam without a gun over time can become relevant for everyone. This question arises very acutely when the time comes to renovate a dilapidated building or build a new one. During this period, very often there is an urgent need to remove gaps and cracks if there is a need or doors. Polyurethane foam – the best remedy, which copes with this problem.
Polyurethane foam says no to cracks!
Among the various types of sealant, polyurethane foam is the most popular. This material will help very well in walls, cracks and joints that are more than three centimeters wide.
The packaging in which the foam is sold is an aerosol spray can made of metal. Despite the light weight, the concentration of contents inside is very high. From the container of one package you can get more than 40 liters of foam to seal various cracks. With the help of video instructions, you can gain skills in competently working with this sealing agent.
Before you start using polyurethane foam without a gun, you need to take into account that this substance becomes hard under the influence of a humid environment, and also noticeably increases in volume after using the balloon. It has a porous structure and has excellent thermal insulation properties. Due to the fact that foam has a possible long term service, explains its indispensability during repair and construction work. With its help, you can seal cracks, fasten structures, secure joints, heat and sound insulate these places.
This solution has several categories - semi-professional using a plastic tube and professional (pistol type, you can read in detail), winter, summer and all-season. This cylinder device was invented with the goal of easily displacing foam from the cylinder with a special gas. As a result, a liquid polymer is formed, it hardens and polyurethane foam is formed.
So, polyurethane foam is universal remedy, which has heat and sound insulation properties, connects, fastens and glues different parts, is convenient for installation work, and has practical packaging. When it expands, you can qualitatively seal joints and seams; after hardening, you do not need to pay attention to it in the future.
Previously, an alternative to this material was cement mortar, but its production is a labor-intensive process that takes a lot of time. Due to its simplicity, convenience and combination in working with metal, wood, concrete and stone, you can give preference to a foam solution.
What you should pay attention to when purchasing polyurethane foam:
- First of all, you should pay attention to ensure that the product does not turn out to be a fake. The main criterion here is the country of origin.
- When purchasing a product in a store, you need to pay attention to the production date and the indicated shelf life.
- You need to check the weight of the cylinder before you buy, as well as the cleanliness of its valve, in order to avoid purchasing a used product.
- The purchase of polyurethane foam depends on the time of year.
- It must be taken into account that the volume of substance released from the cylinder has same sizes, does not differ in consistency.
- Main criterion good product– after it has been applied to a vertical surface, it should not slide off walls and window surfaces.
- The sealant is applied to the surface by uniformly squeezing out the substance and at a constant speed.
- Foam is sold in aerosol cans made of metal. They are lightweight, easy to use and have a high concentration of content - more than 40 liters of foam are obtained from one package when used.
- This design was not invented by foam manufacturers by chance - with its help, the material comes out when there is a special gas inside. As a result, the polymer successfully hardens at the gaps and joints and a fairly rigid base is formed.
Working with polyurethane foam is a process that does not require much effort. It is simple and convenient. But in order not to deteriorate the quality of work, you need to know certain subtleties.
- Firstly, installation work carried out in the absence low temperatures. According to expert advice, the hardening process occurs more efficiently at temperatures from plus 5 to plus 30 degrees. Such work is carried out from mid-spring to mid-autumn. The exception is winter types of foam.
- Secondly, you only need to carry out the work while wearing gloves. They allow you to avoid contamination of your hands and, as a consequence, long process cleaning from foam solution. Workers often miss this rule, which is quite dangerous. Therefore, questions often arise.
- Third, don't try to work with foam everywhere. If you need to fill a gap with a width of 1 to 8 cm, then using polyurethane foam is acceptable and approved. In the case where the slot size is larger size, then it’s better to use alternative materials such as plastic, brick or foam. If less than a centimeter, you can use putty. It should be remembered that after finishing work with the sealant, the excess amount of foam is cut off with a knife (do not remove the excess with your hands).
- Fourthly, before applying the foam, it is advisable to water the space to be sealed. Hardening and polymerization of the foam occurs much faster and more efficiently when the ambient humidity ranges from 60 to 80 percent.
- Fifthly, shake the container well before starting work. This should not last a couple of seconds, but about a minute. This is enough for the solution inside the container to turn into a homogeneous mass.
We take the can in our hands. Before removing the protective cap, first shake the contents of the container. After screwing the supplied tube onto the adapter, turn the cylinder upside down. This is the position in which the cylinder is used during installation work. This subtlety is very important because the gas displacing the foam is very light and the entire mixture is mixed more efficiently when the cylinder is positioned upside down.
Now we apply the foam, taking into account the fact that it increases in volume. Therefore, it is necessary to apply foam into the hollow space no more than a third. After some time, the volume increases another 2-3 times and after that you can cut off all the excess with a knife. When applying foam not horizontally, but vertically, the solution should be directed from bottom to top. This ensures ease of application and the appearance of a base for fixing the sealant that has not yet hardened.
After applying the foam, it is sprayed with water to improve and more efficiently harden the process. When we see a shortage of foam at the joints, we need to wait a little time, about half an hour, for the bottom layer to harden, and then we can add it to the same places. But don’t try too hard; the excess won’t be needed anymore.
In one pass, the foam layer when applied has permissible value three, four centimeters. In the case where the gap is larger, the foam is applied sequentially, layers are applied one after another.
After 8 hours have passed since the foam was applied, it will completely dry. You should not try to start arranging furniture, wallpapering, or installing shelves immediately after applying the foam. In sealed joints, remove excess foam and cover with leveling agents ( best options– this is plaster, paint or cement).
You can also use polyurethane sealing tape as protection. This helps to increase the service life and prevents exposure to ultraviolet rays. You can use a spray gun for whitewashing, and then proceed to other stages of finishing work.
Quality check – saving time and money
The foam solution must be elastic and adhere well to the surface being treated. High-quality foam, after it has settled and hardened, will not disintegrate into small crumbs. To avoid unnecessary problems before the material has completely hardened, you must not touch it or start processing it, in order to avoid changes in the structure of the material itself and not to interfere with the polymerization process.
Available good quality work performed only if the material meets the relevant standards. Then you won’t have to redo the work of sealing the joints. It should be taken into account that there are cans on sale in different price categories and which have different foam output capacities. In this case, it is more profitable to purchase aerosol can at a higher price so that it will last all the way than buying several cheaper ones.
Polyurethane foam – excellent repair quality
When purchasing foam material, you need to remember that the use of the cylinder is designed for one-time use only. Based on this, there is no need to use the balloon twice. If you know how to use polyurethane foam without a gun, then it is not difficult to calculate the volume required to complete this job. Otherwise, it is better to get advice from those who work in this field, or consult with a salesperson in a store.
Repeated use of a container with foam occurs only when an operation with sealant is carried out after a short time. In this case, upon completion of the first stage of work, treat the tube (gun) and valve with a liquid specially designed for this purpose to remove foam. But, as a rule, workers construction sites this method is not used.
- To remove excess, you need to prepare a water sprayer and a knife to cut off the excess in advance.
- If the foam ends up in unnecessary places, you can remove it with a soft acetone sponge.
- Economical consumption of polyurethane foam will help avoid additional costs for cylinders.
- The surface must be treated after applying foam after 4 hours. After 7-8 hours it will become more difficult to cut, and the hardening process will be completely completed.
- The work should be done using a respirator; it will protect the human body from unnecessary chemicals. It also won’t hurt if the worker has glasses, gloves and overalls. So it's not an easy matter.
- You should not wait until the foam becomes dark in color, as this indicates that a reaction to ultraviolet radiation has begun (initially it has a light yellow tint).
- It is forbidden to use polyurethane foam near an open fire and store the cylinder under the influence of open sun rays(this is a common rule, but often it is not followed and there is a risk of running into the consequences of a fire and the arrival of firefighters). The sealant contains various components that can be flammable. This can lead to very sad consequences. Foam has classes: fire-resistant, self-extinguishing or flammable (this must be found out in advance).
- Problems also arise if the foam is applied to a dirty surface. To solve this problem, the surface to be treated is cleaned with a vacuum cleaner.
- If the temperature outside the window is below plus 5 degrees, then the product’s viscosity may not be suitable for use due to non-compliance with standards. Also normal structure foam can be disrupted by an increase in ambient temperature to 30-35 degrees Celsius (an exception is all-season foam, which is suitable for use at temperatures from minus 10 to plus 40 degrees).
- If you take the risk of using summer foam in winter, you run the risk of getting foam that crumbles and has glassy bubbles. It begins to creep down, which means money wasted. For information, the all-season solution has a temperature range of up to minus 10 degrees for the contents of the cylinder and minus 5 for the temperature of the container
Provided that you have taken into account all the tips on how to use polyurethane foam without a gun that were mentioned here, you can proceed with complete confidence. construction work, which involve the use of polyurethane foam. Using foam material, you can carry out work on insulating distribution networks that have seals with different widths of seams and cracks, and it is also easy to fill excess voids in the walls. So you can safely begin high-quality repairs!
Video: HOW TO USE FOAM
Almost every person has used polyurethane foam at least once - modern means for sealing, repairing, installing windows and doors, sealing cracks and joints. Using polyurethane foam is quite simple. There is a special gun for this, but sometimes for small repairs in the house you can do without it. But even simple work must be done correctly to achieve High Quality.
Peculiarities
A huge assortment of polyurethane foam in specialized retail outlets makes you think when choosing required material. Each of us wants to choose a high-quality and inexpensive composition. Currently specialized outlets They offer customers two varieties of this material: household and professional. Let's look at the features of each.
Household
The main distinctive features of household polyurethane foam are the volume of the cylinder. Manufacturers produce this material in small cylinders (about 800 ml). The bottle comes with a tube small size with a small section. The pressure level in household polyurethane foam cylinders is low, this is necessary in order to significantly reduce material consumption when performing repair work. To perform them using household polyurethane foam, you can use a special gun. The cylinder valve is designed to fix the tube and mounting gun.
Professional
To install doors, windows, and plumbing fixtures, they use a professional type of polyurethane foam. Manufacturers produce this material in cylinders with a capacity of more than 1.5 liters. The sealant is in a cylinder under high pressure. It is recommended to carry out work using professional sealant using a special gun. To make the use of the material most convenient, the cylinder is additionally equipped with fasteners for strong fixation inside the gun. A large amount of sealant in the cylinder is designed for large-scale work.
Sealants of these varieties have similar technical characteristics. When choosing the required material, you need to consider for what purposes the foam will be needed. In addition, the amount of work is also important.
Distinctive feature compositions is the possibility of re-application.
Operating rules
To perform high-quality repair or installation work using sealant, you need to know several rules for applying the material.
- The use of a special mounting gun guarantees a better result of the work performed.
- Nessesary to use professional option sealant having useful property: Quite low secondary expansion.
- It is recommended to carry out installation and repair work in the warm season: this will speed up the hardening process of the foam and preserve all its technical qualities.
- When performing work, it is necessary to use personal protective equipment.
- It is recommended to use sealant to seal minor cracks about 8 cm wide. If the width of the cracks exceeds this figure, it is advisable to use other materials (brick, wood, plastic).
- To seal cracks and crevices less than 1 cm wide, it is more economical and practical to use putty.
- During operation, the container with polyurethane foam must be kept upside down.
- Fill the gap with sealant to one third of the depth.
- After the sealant has hardened, you need to remove excess foam using a special knife.
- After completing all the work, it is necessary to cover the frozen layer of foam with special means to protect it from exposure to sunlight.
- To perform work on the ceiling, you need to use a special mounting foam: such a container with sealant can be used in any position.
- To foam deep crevices or cracks, you need to use special extension adapters.
- During operation, the foam container must be shaken and the nozzle of the mounting gun must be cleaned of excess sealant.
How to apply?
Before you start working with this sealant, you need to learn all the intricacies of its use. Otherwise, the quality of work will suffer, the consumption of sealant will increase significantly, which will lead to additional financial costs. First you need to choose the right mounting foam. The choice of material depends on the volume of work.
If you plan large-scale installation of doors, windows or plumbing, or a large volume of repair work, it is better to opt for professional polyurethane foam. The cost of materials of this kind is much higher, but the result of the work performed will pleasantly please you.
Minor indoor repairs (for example, sealing cracks) require the purchase of household sealant.
Applying sealant to the surface without a mounting gun can be done in several ways.
- For minor repairs, you can do without a gun. A special small tube is installed on the cylinder valve. Next, the renovation work begins.
- Professional foam can be applied using a tube, but this method will lead to a lot of material consumption and unnecessary financial costs.
- If it is not possible to use a mounting gun when working with professional sealant, you can use two tubes different diameters. To do this, on a cylinder with professional foam a large-diameter tube is secured, then a second (smaller) one is attached to this tube and carefully fixed. This method will significantly reduce material consumption and reduce financial costs.
Once you have decided on the method of applying the foam, you need to prepare the surface. In some cases, the sealant surface can become a false wall. The quality of seam sealing depends on how thoroughly the surface is prepared. The surface is thoroughly cleaned of dust and dirt. Special attention it is necessary to pay attention to the cracks that need to be foamed. Sometimes the surface needs to be degreased.
Large cracks are pre-filled with polystyrene foam. or others suitable material. Only after this can they be filled with foam. This will significantly reduce foam consumption and increase the quality of thermal insulation. Before starting work, the surface must be moistened. A simple spray bottle is perfect for these purposes.
Now you can start sealing. For correct execution work foam should be room temperature. Before starting the process, shake the container thoroughly. Only after this a tube or gun is attached to the cylinder. Now you can apply the composition.
If you decide to use foam without a special gun, you need to consider the disadvantages of this process.
- Due to high pressure in the cylinder, the consumption of foam increases significantly (sometimes two or three times).
- The valve design of some cylinders does not provide for the use of a tube.
Carrying out sealing work with a gun saves a lot of time. Foaming the surface with polyurethane foam using a gun is not at all difficult.
It is enough to learn how to dose the foam output. In this way you can glue any objects, not forgetting about preparing the surface. Then we begin to apply the sealant. It is important to remember that you need to fill the vertical gap with sealant from the bottom, smoothly moving upward.
After finishing work, you must thoroughly clean the gun from foam using a special washing liquid. It needs to be poured into the tool. If during work a small amount of sealant gets on your hands, it must be removed with a solvent. Excess foam from contaminated areas must be removed during operation with a sponge soaked in solvent. If the sealant has hardened, you will have to remove it mechanically.
You cannot work with expired foam. The spray can must be handled carefully. You can't bring it near the fire. If the expiration date of the polyurethane foam has expired, the material loses its properties.
When choosing polyurethane foam, you need to remember that the container can only be used once. Therefore, before purchasing, you must carefully calculate the required volume. If you have any doubts about this, it is better to consult a specialist.
Take note of some useful tips.
- Before starting work, you should prepare a spray bottle to spray water on the surface before applying foam; you will need a knife to cut off excess material.
- While doing the work, you will need a sponge or soft cloth soaked in acetone or solvent.
- The correct dosage of sealant will significantly reduce material consumption.
- It is more convenient to remove excess sealant from the surface after four hours after application; after complete hardening, this process will become much more difficult.
- Be sure to use personal protective equipment (respirator, goggles, gloves).
- It is necessary to ventilate the room during work.
- After completing all work, it is necessary to process the frozen foam special means for protection from sun rays. This must be done before the foam darkens.
- It is strictly forbidden to use the cylinder near an open fire.
Polyurethane foam is one of the most popular materials on the market. We have made a selection of various tricks and life hacks that will make working with it easier and more comfortable, as well as find new areas of application for it.
- The main components of polyurethane foam are polyol and diisocyanate, the reaction of which produces a prepolymer. For polyurethane foam to harden, moisture is required, which is usually taken from the surrounding air. According to certain calculations, it takes approximately 40 ml of water to harden the foam from a 750 ml cylinder. Based on this, we can draw the first conclusion that the presence of moisture (up to a certain threshold) promotes rapid hardening of the foam and prevents its further expansion. Therefore, it is recommended to pre-moisten the areas where the foam is applied with water. In addition, this will improve the adhesion of the foam to the applied surface.
- Rodents have a long-standing love for polyurethane foam, which they easily turn into dust. But at the moment, compounds have begun to appear on the market that rodents do not like.
- Since the foam container must be held upside down when working, with an extension made of PVC pipe, you can easily handle even cracks in the ceiling or in any hard-to-reach places.
- Acetone, as well as solvents based on it, can easily clean the surface of uncured foam. But with a frozen one, such a trick will no longer work.
- The older the foam in the container, the higher its viscosity. Accordingly, its expansion coefficient and final volume decrease. To prevent the viscosity of the foam from growing so quickly over time, manufacturers make special additives, so it is recommended to shake the contents of the container thoroughly before starting work.
- The gun will allow you to dose the foam more accurately, thereby giving you additional convenience and savings. It will also be convenient for large volumes of work. High-quality models can be left without washing for a month or more. In other cases, you should use a bottle with a special flushing liquid.
- Some manufacturers offer black foam cylinders. It is also perfect for landscape work. For example, to fix stones on alpine slide. As long as it doesn't get direct sunlight.
- If you need to apply foam in several layers to cover large openings, manufacturers recommend waiting an hour or two between laying each new layer. But if each layer is slightly moistened with a spray bottle, then the waiting hours can be reduced to 10-15 minutes.
- In the absence of appropriate filler, polyurethane foam will also help when transporting fragile items. To do this, you need to line the box with cling film, fill it a third with foam, put a layer of film on which to place the fragile item. Then there is another layer of film on top, which is also covered with foam. As a result, your foam will be easily separated into two parts, which will simplify unpacking.
- For foaming cracks in windows and doorways Foam with a minimum coefficient of expansion should be used, otherwise it may be difficult to open windows and doors. Typically, such foam is labeled as window foam. But if you don’t have one at hand, it’s better to apply the foam in two layers. First, a small amount of foam is placed deep into the crack, to which, after final expansion and hardening, another layer can be added if necessary.
- In the absence of acetone, you can rinse the plastic nozzle tube using carburetor cleaner (it also contains acetone). You can purchase it at any auto parts store. But this must be done immediately after use, before the remaining foam has hardened.
- Winter foam can be used at temperatures down to -10 C°, and some types up to -20 C°. But at the same time, the foam container itself must have a temperature of at least +5 C°. To quickly warm up the cylinder you can use hot water, but under no circumstances should you place it in an open fire or use other methods of rapid heating. Otherwise, the result may be sad.
- You can get rid of spilled or splashed foam after it has hardened using special cleaning gels designed for foam. They soften it, after which the foam can be easily removed.
- When working with foam, do not forget to wear gloves, otherwise the foam that gets on your skin will leave stains on it for a couple of days.
Polyurethane foam is very practical and comfortable material, the advantages of which are appreciated not only by professionals, but also by home craftsmen. However, there are small tricks that will help you expand the scope of its use or use foam more competently.
Remember that polyurethane foam, like any other product, has a limited shelf life. When purchasing, be sure to check it on the bottom of the can.
Before starting work, shake the can thoroughly, and while working with it, hold it upside down. This is necessary so that the gas squeezing the contents out is above the foam.
How to apply polyurethane foam correctly
Since the polyurethane foam coming out of the can needs moisture for its effective expansion, which it mainly receives from the air, first slightly moisten the area being treated with it. However, remember that over-wetting may prevent it from sticking.
When the polyurethane foam has hardened, its excess is removed with a knife.
How to foam hard-to-reach places
If you need to foam some hard to reach place, the tube usually included with the can can be very difficult to work with. To perform this operation, you can put a thin flexible hose on the standard canister tube.
When the area being treated with foam is too high, the end of the flexible hose can be secured to some kind of holder or a regular stick. And don’t forget, you should always keep the can upside down!
When foaming a very narrow gap, you can heat the extension hose with a match, pull and break it.
At the point of rupture, the diameter of the hose will be very small, which will guarantee high quality sealing of a small space.
What to do if you lose the tube included with the can
If this much-needed tube is lost, then you can attach a heat-shrinkable tube to the spray can dispenser, and use a fairly wide washer as a dispensing stop.
In this case, you can work with the foam just like with a regular original tube.
How can you clean drops of polyurethane foam?
If you accidentally drop foam somewhere, it is better not to smear it and wait until the foam mass dries. Then simply peel off the hardened material. If a drop of foam is still smeared, use regular acetone, which will easily dissolve the polyurethane composition.
And further. Don't forget that polyurethane foam is an excellent and reliable adhesive!
