The Dow GREAT STUFF™ Pestblock Insulating Foam Sealant is built as a pesticide-free way to block pests out while also air-sealing the location.

Build

The gunnable canisters only work with gun dispensers! Use any of the GREAT STUFF PRO Dispensing Guns to direct the foam into the gaps and cracks you want to fill.

Seals gaps and cracks up to 3” to provide an airtight seal and is water-resistant.

The product is trimmable after 60 minutes with a serrated blade and can also be sanded, stained or painted.

The surface of this foam can discolor when exposed to sunlight so it is recommended to paint it if this makes a difference to the appearance of the final finished project.

Pestblock contains no pesticides so it is a friendly way of blocking pests from entering any location!

Safety

Wear eye protection, gloves and protect the area from the excess product.

Uncured foam can be cleaned with acetone or GREAT STUFF PRO Gun Cleaner for best results!

Cured foam on hands or surfaces must be removed mechanically or allowed to wear off.

Keep ignition sources away from this foam and use them in well-ventilated areas.

How to Use 

• Shake can vigorously for at least 30 seconds
• Invert can and screw onto the gun adapter
• Adjust flow control to open position and immediately squeeze the trigger to fill the gun barrel with foam
• Dispense a small amount of foam into a waste bin or bag to fully prime gun
• Keep can in inverted position when in use
• Dries grey colored and cures rigid
• Not suitable for being dispensed in cold temperatures
• When flow control is fully closed, the canister can stay on the gun and can be reused within 30 days. Simply shake vigorously and reopen flow control to reuse.

How to Change Cans

• Always leave a can on the gun unless it has been thoroughly cleaned with the GREAT STUFF PRO Gun Cleaner
• Shake new can for one minute
• Unscrew old can, immediately screw on a new can
• Dispense a small amount of foam into a waste bin or bag to fully prime gun

Technical Data

Certifications, Standards, and Regulations

• UL Classified
• CCMC 13074-L