This Is A High Quality, Airless, Spray Application Rubber Coating. The Product Is Completely Water And Fuel Proof, While Also Having Great Adhesion To Most Surfaces. Leak Stopper Rubber Waterproof Repair Sealant Spray Leak Seal Black Rubber Coating Spray Tube Is A Professional Rubber Sealant/Waterproof Repair Spray Both In Interior And Exterior Wide Usage. It Can Seal Leakage Cracks, Punctures, Holes Or Damaged Places On Roofs, Gutters And Other Substrates Such As Concrete, Plastic, Wood And Steel Structures.