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Unlike traditional paints Flex Seal Liquid starts out as a thick liquid that can seep into cracks and holes to form a waterproof weatherproof rubberized seal. Easy to use! You can brush on- roll- dip or pour to stop leaks fast.Specifications for the Flex Seal LFSMAXBLK02 Flex Liquid MAX Black 2.5 Gal.: Thick liquid that dries to a flexible watertight rubberized coating. Creates a flexible rubber barrier that blocks out air water and moisture. Non-Toxic Non-flammable no harmful vapors UV chemical and mildew resist Seals and protects from the elements and extreme temperatures.