Flex Seal MAX Aerosol is built for maximum sealing strength and easy application. This fast, spray-on sealant goes on smoothly and forms a durable, flexible barrier that helps stop leaks and seal cracks, gaps, and hard-to-reach areas. Designed to help block out water, air and moisture, Flex Seal MAX creates a tough protective layer that holds up against the elements and stays flexible over time. Use it on a variety of surfaces and projects, from quick household repairs to larger outdoor jobs. Simply spray to coat and seal, then let it cure for a strong, long-lasting seal that helps keep water out and protection in.