How do you use hand held  Polyurethane foam spray?

Polyurethane foam spray is used as per procedure mentioned below:

  1. clean the surfaces thoroughly such that it is free of dust, dirt, grease,oil.
  2. Always wear safety glasses and gloves.
  3. Moisten the surface using water spray bottle.
  4. Shake the can vigorously, about 20 times
  5. Screw the straw onto the can.
  6. Turn the can upside down.
  7. Fill the joint for about 50%
  8. Cut the excess foam after it is cured, normally after 30- 60 minutes

How do you seal windows with polyurethane foam spray sealant?

Sealing around windows and doors is one of the most common uses for expanding foam. It is formulated to fill the space around windows and doors without excess expansion.

What if the cured PUF is left uncovered?pu spray sealant

 As Polyurethane Foam is not Ultra Violet Resistant, the color of uncovered PU Foam will turn to dark yellow from light yellow within a few days. In the long run the foam will disintegrate.

What material should we use to cover PUF spray sealant after application to protect it from UV. Rays?

Polyurethane Foam can be covered with plaster, plaster of Paris, polysulphide (in case of expansion joints) or acrylic elastomeric paints in some cases. Where finishing is not very important, paint can be applied directly.

How cost effective is PU Foam compared to any other materials used in similar kind of applications?

750 ml. dispenser gives coverage of at least 35 litres = 35000 cc., considering 10% handling loss than coverage is = 32000 cc., with reduction

On which surfaces can PU Foam spray be applied?

Polyurethane Foam can be applied on various surfaces such as wood, metal, concrete, brick, plaster, (except polyethylene, polypropylene, silicone and Teflon) 

Buy Polyurethane foam spray sealants- Amazing offers available on request: Call 18001214771, Whatsapp: 9833892782

Is pu  foam spray insulation waterproof?

Polyurethane Foam spray has a closed cell structure, which gives complete water protection however it cannot be used for waterproofing, especially where the hydrostatic pressure is very high.

Can PU Foam spray be used to fill wall cracks?

Polyurethane Foam may also be used to fill small cracks. For this purpose it is necessary to use the added reduction needles.

Can PU Foam be used for expansion joints? If yes, than what should be used to cover PU Foam?

Polyurethane Foam spray sealant can be used as a backup material in expansion joints and can be covered with Polysulfhide/ PU sealant.

Is PU Foam toxic? Stability / Tack free time?

It is non-toxic as well as CFC free. Tack free after approx.10 min. can be cut after approx.30 min. Cured within 2 hours. Stable within 4 to 6 hours.

Is any different colour or packing of PU Foam available?

B3 type PU Foam spray sealant  comes in only one colour i.e. light yellow. The cured foam can be painted according to customers need. There is only one type of packaging 750ml. dispenser can (Used with dispenser gun/plastic adaptor)

Is PU foam a barrier to insects and rodents ? Will mice eat expanding foam?

Regular Pu foam spray do not contain chemical rodent deterrents or rodenticides.

Pest Control with PU spray sealantMice can and will chew right through the regular expanding foam, but there are formulas that stop insects and rodents.

Such special grade PU foam, Eg; Supex 100 PUF help prevent insects and rodents from entering structures through voids, cracks and crevices.


Is it necessary to moisten the surface before using foam?

 We recommend moistening because the system needs water to cure. Other benefits one will get: i. Better cell structure ii. Better adhesion iii. Faster curing iv. Better foam quality

Is Expansion foam resistant to water?

Cured foam provides a barrier to moisture. However, over time, small quantities (depending of skin is on the foam) of water vapor will migrate through the foam. If the skin stays on the foam, the weight will only increase by 5%. If the skin is cut away, the weight can increase up to 150%. In that case foam is not water resistant. The water vapour permeability depends on the density and the cell structure of the foam. If you got more open cell structure or a lower density the permeability will

How much does PU foam spray sealant expand?

The expansion is different for gun and hand-held foam. i. Hand-held foam will expand by 150-200% which means that you only have to fill the joint by 40-50%. ii. Gun foam will only expand by 50-100%, so you have to fill the joint by at least 50%. The expansion depends on the temperature of the ambience, temperature of the can and the humidity.

How should I store an opened can of gun foam spray?

The best thing you can do is leave the can on the gun. If you do not leave the can on the gun, clean the valve and the gun with Gun & Foam cleaner. We recommend to empty the can in the next weeks.

Is there a negative effect on the puf foam if the can is not shaken thoroughly prior to use?

Polyurethane foam consists of a prepolymer and a propellant gas, which form two layers during storage. The can must be shaken vigorously before use to create a homogeneous mixture. Insufficient shaking will result in poor foam properties such as a coarse cell structure and reduced foam volumes.

How much must the cans be shaken to ensure a homogeneous mix of the two constituents?

A canister should be shaken 15 to 20 times.


Does the canister need to be shaken again during use?

It is recommended to shake the can occasionally during use, and especially after interruptions, to avoid re-separation of the propellant & prepolymer.

How does the puf foam get the right amount of moisture?

Fresh foam absorbs moisture from its surroundings. In particularly dry environments it makes sense to wet the surfaces to be joined. But standing water droplets are to be avoided, as in this case the water would actually become a barrier to proper adhesion.

What happens when there is insufficient moisture on the surfaces or in the surrounding environment and no water has been sprayed onto the foam?

A lack of moisture leads to inefficient curing of the foam and, depending on the amount of foam applied, may lead to foam compression – even months later.

Is there any way to accelerate the curing process?

Yes, wetting; ideally from a spray gun. This will help to speed up the hardening process.

Is cured foam subject to ageing?

Cured foam does not age.  There has never been a case during the thirty years that polyurethane foam has been in use that any failure has occurred through ageing.

Can gaps between polystyrene insulation panels be filled with one – component polyurethane?

Yes, one-component polyurethane foam can be freely used for such applications. It is free from solvents and does not attack polystyrene.

Is it OK to leave half-empty canisters attached to applicator guns?
 Yes; in fact we recommend leaving a partially-full container attached to the gun. To store the gun and canister safely, the security screw should be tightened to secure the trigger.

Is it necessary to remove excess foam from the adapter, or can I simply insert the next canister?
Though the adapters are constructed from a non-stick material, it is advisable to remove any excess foam straight away with gun cleaning fluid: well-maintained tools last longer.

How long can a partially used container be left attached to a gun?
If the trigger has been completely secured with the security screw, a canister can be stored attached to the gun for a period of one to two weeks.

Why should we allow a minimum gap of 10 mm along the perimeter of a window and not less?

The gap of 10 mm.all along the perimeter of the window, allows the PU foam to spread smoothly through the surface of the wall, provides sufficient space for PU Foam to expand. The amount of PU Foam in the 10 mm gap is sufficient to provide the required strength and binding force between the wall and the window.

Is Polyurethane Foam spray fireproof?

B3 Grade is non FR type product while B1 grade is FR type PU foam

Is any training required for the application of PU Foam?

Application of PU Foam is very easy and does not require any special skill. However for the first time users training is recommended. Training will be given by the sales staff and/or by the dealer.

What precautions should be taken while applying PU Foam?

  1. Contact with foam should be avoided from body parts and clothes. In case the foam sticks to any part of the body or clothes, wash the affected area with PG2 PU Foam Cleaner
  2. The nozzle should be kept away from the body while
  3. The can should be kept in the Inverted position while
  4. Cured foam has to be removed mechanically

What is the purpose of Remover? Can any other material be used?

Remover is used to clean the dispenser gun and the needles. The Remover can be mounted on the dispenser gun, thus cleaning the dispenser gun more effectively. By using any other material the chances of damaging the gun increase.

How to clean/remove PU foam ?

If wet or uncured PU foam gets on skin, quickly and carefully wipe it off using a cloth without spreading the foam around then remove residual wet foam using acetone or fingernail polish remover (with acetone), or a polyglycol-based skin cleanser. Then wash with soap and plenty of water.

How do you remove cured expanding foam ?

Steps to Remove the Stain:
  1. If the foam has not yet fully hardened, wipe off as much as possible with a cloth or paper towel.
  2. Blot the remaining foam with some acetone nail polish remover. 
  3. Continue blotting the foam with the acetone until it is removed.

How easily can a window mounted with PU Foam be removed?

Window mounted with PU Foam can be removed easily by slicing through the foam, but removal of the window by force is near to impossible.

Does the foam develop and exert pressure during expansion and curing?
Yes, the foam exerts a pressure during expansion and through hardening. It is therefore advisable to fill gaps and cavities by no more than one third.

What should I do with excess foam such as that round doors and windows?Best Adhesive & Sealants Whole Seller
Cured excess foam can be cut away with a knife, saw or any similar implement.

Who are the Pu foam spray can manufacturers in India?

No one. As of April 2020 no one manufactues PU foam spray in can in India. High quality products are imported from Europe and the USA. Others from China.

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Polyurethane Foam - Frequently asked questions
Article Name
Polyurethane Foam - Frequently asked questions
Polyurethane foam spray sealants is used for various applications across the industry. This article is a basic guide to understand do's and dont's while using polyurethane foam
Publisher Name
Anagha ASF LLP
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