• Product Details
    GREAT STUFF PRO™ Pestblock Polyurethane Foam Sealant is a gun-applied, insulating foam sealant that expands up to 3 inches to take the shape of gaps, creating a long-lasting, airtight and water-resistant seals that block spiders, ants, cockroaches mice, and more from entering the home without the use of pesticides.
    • 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.

    How do I get Great Stuff™ foam off of my skin?


    If the foam has not cured or hardened, use fingernail polish remover (with acetone); a polyglycol-based skin cleanser or corn oil may be effective. Then wash with soap and plenty of water. If the foam has hardened, there is no solvent that will remove it. It will not harm your skin and will wear off over time. To remove cured foam from skin, use a pumice stone (available at most drug stores) and warm, soapy water. Then apply petroleum jelly.


    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.

    • Shake vigorously for a minimum of 60 seconds. If the can sputters, simply shake the can while held upside down.
    • Any uncured product that gets on the skin can be removed with acetone.  
    • Best results if used 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.
    • Firmly screw straw assembly onto valve and dispense SLOWLY.
    • Mist with water to speed cure.
    • Trim cured foam with serrated blade.
    • If applied outdoors, be sure to paint or cover foam to prevent discoloration and UV damage.

    If using GREAT STUFF PRO™ with the Foam Dispensing Gun, follow these additional steps before application:

    • 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.
    • Tighten the flow control screw until fully closed for storage. Use can within 30 days of initial use.
    • Store upright with a foam dispensing gun attached.
    • Fill gaps <50%
    • Always leave a can of foam attached to the gun with the flow control screw closed.
    • When ready to change cans, shake the new can of foam for a minimum of 60 seconds.
    • 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 to Use

Indoor/Outdoor Use

Attic Penetrations


HVAC Penetrations

Pipe and Plumbing Penetrations

Electrical Penetrations

Rim Joists

Sill Plate



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

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Uses a flow-control mechanism that dispenses beads from 1/8” to 3” to provide greater precision and access to hard-to-reach areas.



Bonds to wood, metal, masonry, glass and most plastics to fill gaps and cracks up to 3" while blocking the spread of smoke.



Specifically formulated to stop drafts by air sealing the gap between the window or door frame and its rough opening.



Provides a fast-grab tack and long-term high-strength bond, even in conditions, leading to fast and reliable installations.