Great Stuff 20 oz. Gaps & Cracks Insulating Foam Sealant is your go-to solution for filling, sealing and insulating small openings around the home. Formulated with a convenient straw applicator, this minimal-expanding, polyurethane-based foam expands to lock out drafts, moisture and pests—boosting energy efficiency and comfort. Once dispensed, it bonds to wood, metal, masonry, glass and most plastics, and can be painted, sanded or trimmed to blend seamlessly with your project.

Whether you’re sealing gaps around plumbing, wiring or HVAC, or insulating cracks in walls and voids up to 1 inch wide, this cream-colored foam is ideal for both interior and exterior applications. Tack-free in as little as 5 minutes and fully trim-ready in about an hour, it cures rigid and waterproof, creating a durable, airtight barrier.

Key Features

• Expands to fill gaps, cracks and voids up to 1 inch
• Provides insulation and air sealing to improve energy efficiency
• Cream-colored foam blends with most surfaces and accepts paint
• Tack-free in 5–15 minutes; trim and tool in 1 hour
• Bonds to wood, metal, masonry, glass and most plastics
• Minimal expansion formula for controlled application
• Forms a rigid, waterproof barrier that resists moisture and pests
• Suitable for interior and exterior use