• Product Details

    GREAT STUFF PRO™ Pestblock Polyurethane Foam Sealant kit expands to form a long-lasting, airtight, and water-resistant barrier that blocks Insects and critters from entering the home while boosting energy efficiency.

    Kit includes:

    • 2 cans 20 oz Great Stuff Pro™ Pestblock
    • 1 Great Stuff™ Foam Dispenser Gun
    • 4 Plastic Nozzles, 4 - Plastic Straws
    • 1 can Great Stuff Pro™ Foam Cleaner
    • 1 pack of Nitrile Gloves
    • 1 roll 4in x 20in Copper Mesh
    • Reusable for 30 days when left attached to GREAT STUFF PRO™ Dispensing Gun
    • Blocks critters, bugs and other pests from your home
    • Pesticide-free
    • Won’t harm bees
    • Expands to fills, seals, and insulates gaps up to 3 inches (76mm)
    • Forms a long-lasting, airtight, weather-resistant seal
    • Adheres to wood, metal, masonry, glass and most plastics
    • Precise application with no mess
    • Interior/exterior use1
    • Tack-free in 6 minutes2; trimmable in one hour
    • Paintable, stainable and sandable
    • Grey-colored foam for easy identification
    • UL classified
    • CCMC 13074-L

    1 Skin of cured foam can discolor if exposed to natural light. Paint or coat foam for the best results. 

    2 70 ± 5°F and 50 ± 5 % RH, 1-inch bead diameter, 6-inch length. The cure rate is dependent on temperature, humidity, and size of the foam bead.

  • Q.

    Where can I use Great Stuff Pro™ Pestblock?


    Great Stuff Pro™ Pestblock can be used in a variety of interior and exterior applications, most commonly in air sealing and home retrofit applications, including: 

    • Under baseboards and attic hatch frames
    • Hose bibs
    • Dryer vents
    • PVC pipe penetrations
    • Plumbing penetrations



    What is the difference between Great Stuff™ and Great Stuff Pro™ products?


    There are two key differences between Great Stuff™ and Great Stuff Pro™ products:

    • Great Stuff™ uses a straw dispenser; Great Stuff Pro™ has both straw- and gun-applicator options to dispense foam.
    • Can sizes are larger with Great Stuff Pro™ series, so yield is greater.

    Can I clean the Great Stuff™ Black gun?



    1. Unscrew used Great Stuff Pro™ from dispensing gun.
    2. Clean the gun basket and tip by generously spraying and removing uncured foam with Great Stuff™ Foam Cleaner.
    3. Invert the can and install the cleaner onto the dispensing gun.
    4. Press the trigger to flush the foam into waste receptable until only the cleaner is visible.
    5. Allow gun to sit for several minutes and repeat with a second flush.
    6. Remove the can from the dispensing gun and spray into waste receptacle without the can until the gun is completely empty.

    Can mice, insects or other pests chew through Great Stuff™ foam?


    Rodents and small animals, if determined enough, can chew through many materials, including Great Stuff™ foam. We have specifically designed a variation of our Great Stuff™ foam to solve this issue, Great Stuff™ Pestblock and Great Stuff Pro™ Pestblock. They BLOCK insects and pests from entering the home by sealing gaps, cracks and holes where they commonly enter. Great Stuff™ Pestblock and Great Stuff Pro™ Pestblock expand to fill, seal and insulate gaps up to 1" (25 mm), forming a long-lasting, airtight and water-resistant barrier.

    • Mist with water to speed cure.
    • Trim cured foam with a serrated blade.
    • Any uncured product that gets on the skin can be removed with acetone.   
    • If applied outdoors, be sure to paint or cover foam to prevent discoloration and UV damage.
    • GREAT STUFF PRO™ Polyurethane Foams may be reused for up to 30 days when left attached to the applicator gun and when following proper storage procedures.                                         
    • Shake can of GREAT STUFF PRO™ Pestblock vigorously for a minimum of 60 seconds. Tightly secure the can onto the gun before opening the valve to ensure that the can is properly threaded onto the gun basket to prevent leaks. With the can secured, set your desired bead size by adjusting the flow control knob on the back of the gun (bead can be adjusted from 1/8"-3"). Then, pull the trigger to fill the gun with foam, dispensing excess foam into an appropriate waste receptacle. Lastly, test the bead size before applying.  
    • For best results use when product temperature ranges from 60-90°F (15-32°C). The can should not be exposed to temperatures more than 120°F. Cured foam should not be exposed to temperatures in excess of 240°F.
    • NEVER leave a gun without a can of Great Stuff Pro™ attached unless the gun has been thoroughly cleaned with Great Stuff™ Foam Cleaner.
    • When applying Great Stuff™ Polyurethane Foam, make sure to wear PPE, including proper eye protection, gloves, and long sleeve clothing.
    • Extinguish any open flames before applying foam

When to Use

Indoor/Outdoor Use Indoor/Outdoor Use

Indoor/Outdoor Use

Attic Penetrations Attic Penetrations

Attic Penetrations

Ducting Ducting


HVAC Penetrations HVAC Penetrations

HVAC Penetrations

Pipe and Plumbing Penetrations Pipe and Plumbing Penetrations

Pipe and Plumbing Penetrations

Electrical Penetrations Electrical Penetrations

Electrical Penetrations

Rim Joists Rim Joists

Rim Joists

Sill Plate Sill Plate

Sill Plate



There’s a solution for every seal. See what else GREAT STUFF™ has to offer.

View All Products


Everything you need in one kit to reduce unwanted airflow and improve energy efficiency all around the home



Blocks critters, pests and insects. Seals gaps and cracks up to 3" where pests typically enter such as pipe and plumbing penetrations, dryer vents and more