LIQUID RUBBER IN A CAN. It sprays out as a thick liquid, seeps into cracks and holes and dries to a watertight, flexible, rubberized coating that will Stop Leaks Fast®. Once dry, can be painted any colour. Works on: Wood, metal, tile, concrete, masonry, fabric, glass, plastic, aluminum, porcelain, dry wall, rubber, cement, some vinyls and more. It's like a HANDYMAN IN A CAN®.