Effective and easy to use, Great Stuff Pestblock insulating foam sealant blocks insects and pests from entering the home by sealing gaps, cracks and holes while improving energy efficiency all around the home. Great Stuff Pestblock insulating foam sealant is a ready-to-use foam sealant that expands up to 1 inch to take the shape of gaps, creating a long-lasting, airtight and water-resistant seal that blocks out spiders, ants, cockroaches, mice and more from entering the home without the use of pesticides. Pestblock now has the new Smart Dispenser technology that eliminates product waste by providing a precise application with no drips. The new Smart Dispenser allows the user to reuse Great Stuff for up to 30 days.