Great Stuff Pestblock Foam Sealant 12 oz. Gray is the ultimate expanding foam for sealing out pests, drafts and moisture. Its advanced formula expands up to 1 inch to fill cracks, gaps and crevices—creating a lasting, airtight and water-resistant barrier against insects and rodents. The reusable Smart Dispenser straw applicator lets you apply with precision and no drips, then safely reattach for up to 30 days of continued use. Tack-free in just 10–15 minutes and fully trim-ready in 1 hour, this gray foam sealant can be sanded, stained or painted to match any surface.

Ideal for both indoor and outdoor DIY projects, Pestblock bonds to wood, metal, masonry, glass and most plastics. Seal around pipes, vents, electrical lines, rim joists and more to improve energy efficiency, reduce noise and stop pests in their tracks—all with one can.

Key Features

• Expands up to 1 inch to fill gaps and cracks
• Creates a long-lasting, airtight & water-resistant seal
• Tack-free in 10–15 minutes; trim and sand in 1 hour
• Paintable & stainable for a seamless finish
• Bonds to wood, metal, masonry, glass & most plastics
• Covers up to 120 linear feet per can
• Smart Dispenser straw for precise, drip-free application
• Reusable dispenser stays attached for up to 30 days

⚠️ WARNING: Cancer and Reproductive Harm - For more information, visit www.P65Warnings.ca.gov.