Flex Seal Liquid is an easy to use rubberized coating that starts out as thick liquid, seeps into cracks and holes and dries to a watertight, flexible, rubberized coating. Flex Seal Liquid creates a super strong, protective rubber coating that blocks out air, water and moisture. Once cured it forms a watertight, weatherproof, non-slip barrier that is resistant to rain, snow, sun, wind, hail, air, moisture, UV degradation, extreme temperatures and natural weathering. It is mildew and chemical-resistant and helps prevent rust and corrosion. Ideal for DIY projects, crafts and hobbies. Can be used on concrete, glass, brick, stucco, masonry, wood, PVC and so much more.