Flex Seal is a liquid rubber coating spray that turns into a durable waterproof barrier. It’s easy to use and comes in a portable aerosol spray can. Flex Seal sprays out as a liquid, seeping into cracks and holes, and then dries to a rubberized coating. Flex Seal stops vibrations and deadens noise. Flex Seal seals out water, air, moisture, preventing rust and corrosion. Once dry, can be painted any color. EXCELLENT FOR: Arts and crafts, Roof leaks, gutters, RVS, campers, mobile home roofs, skylights, vent pipes, flashings, hoses, PVC Pipes, window sills, A/C drip pans, portable A/C units, duct work, chimneys, boats, bird baths, ponds, fountains, downspouts, flat Roofs, metal roofs, foundations, gravel stops, asphalt shingles, overlapped seams, drip edges, rubberized and granulated roofs and so much more!