Insulating Foam Sealants

Big Gap Filler with Original Dispenser

  • Greater expansion to fill, seal, and insulate gaps up to 3” (76mm).
  • Forms a long-lasting, airtight, weather-resistant seal
  • Cream-colored foam
  • More Product Details

    GREAT STUFF™ Big Gap Filler Insulating Foam Sealant is an expanding foam sealant that fills, seals and insulates gaps up to 3". This ready-to-use sealant is specially formulated to take on common areas of energy loss such as rim joists/sill plates, plumbing, HVAC, and other larger penetrations

    • Expands to fill, seal, and insulate gaps up to 3 inches (76mm)
    • Forms a long-lasting, airtight, weather-resistant seal
    • Adheres to wood, metal, masonry, glass and most plastics
    • All-direction dispensing.
    • Interior/exterior use1
    • Tack-free in 5-15 minutes2; trimmable in one hour
    • Paintable, stainable and sandable
    • Cream-colored foam for easy identification
    • UL classified

    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.

    • 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). Optimal 75°F (23°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.
    • Fill gaps<50%
    • Mist with water to speed cure.
    • Trim cured foam with serrated blade.
    • Not to be used for filling closed cavaties or voids. Not for use in aviation, or food/beverage contact, or as structural supprt in marine applications.
    • If product does not flow easily, do not force product from can.
    • If applied outdoors, be sure to paint or cover foam to prevent discoloration and UV damage.
    • Great Stuff ™ cans with the Original Dispenser will seal shut if left to sit for more than 2 hours after its last use.
    • Check for expiration date on the bottom of the can as product may not dispense after date displayed.
  • Q.Can Great Stuff™ products be used outdoors?


    Great Stuff™ and Great Stuff Pro™ products can be used outdoors. However, cured foam will discolor if exposed to ultraviolet (UV) light. If left exposed, the foam will eventually crumble. Paint or coat foam for best results in outdoor applications. Great Stuff Pro™ Gasket is not approved for used outdoors

    Q.Can I store a Great Stuff™ product if I don't use the whole can?


    Great Stuff™ cans featuring the newly launched Smart Dispenser™ may be reused up to 30 days with the straw left attached to the canister. Just clean the tip after your first use, leave straw attached, and reuse for up to 30 days.

    Great Stuff™ foam with the straw tube applicator will seal shut if left to sit for more than 2 hours after its last use. However, if you leave the straw assembly attached to the can and insert a pipe cleaner (soaked in WD40) into the straw, this may allow the can to be re-used up to 30 days.

    Great Stuff Pro™ can that has been attached to the Great Stuff Pro™ Foam Dispensing Gun can also be left and reused within 30 days.

    Q.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.

    Q.What is Great Stuff™?


    Great Stuff™ is the brand name for a line of one-component insulating foam sealants that can help make your home more comfortable and energy efficient by sealing the gaps and cracks where air conditioned and heated air escape. Great Stuff Pro™ Polyurethane Foam Sealants can be used for both small and large air sealing and retrofit applications by DIY’s or professionals. Great Stuff™ comes in cans with a straw applicator or the new patented Smart Dispenser™. Cans are in 12, 16, and 20 oz sizes. Great Stuff Pro™ series is available in larger cans (20,24, & 30 oz sizes) and use the dispensing guns to apply.

    Q.Where can I use Great Stuff™ Big Gap Filler?


    Great Stuff™ and Great Stuff Pro™ products can be used in a variety of interior and exterior applications, most commonly in air sealing and home retrofit applications. Common Applications include:

    Exterior openings

    Hard to reach spaces

    Rim joist

    Pipe penetrations


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