Flex Seal is liquid rubber in a can. Unlike traditional paints, Flex Seal starts out as a thick liquid that can seep into cracks and holes to form a waterproof, weatherproof seal. Easy to use, just brush, dip and roll or pour to stop leaks fast. Flex Seal forms a durable, breathable, weatherproof, non-slip barrier. It is resistant to rain, snow, sun, wind, hail, air, moisture, UV degradation, extreme temperatures, and natural weathering. Can be used for a variety of coating and sealant applications. Common liquid applications include roof and gutter repairs, ponds and birdbath assembly and repairs, basements and foundations, tools and sporting equipment upgrades and repairs, cars, trucks and vans, RV repairs, campers and trailers, boats and watersports equipment, DIY projects, crafting and hobbies. Recommended surfaces are concrete, glass, brick, stucco, masonry, wood, copper, plastic, tile, fabrics, wires, vinyl, fiberglass, ceramic, porcelain, metal, aluminum, natural stones, foam, asphalt, EIFS, TPO, PVC, EPDM, CSPE and Hypalon polyurethanes.