Aluminum foil backing, butyl rubber. With waterproof feature, our watertight tape can stop the leak effectively. Wide application: suitable for roof leaks, window sealing, rv awning, gutters, down spouts, boats, personal watercrafts, canoes, outdoor equipment, mobile homes, rv’s & campers, pvc & plumbing pipes, sprinkler systems, doors, walls, seams, vents, air ducts, hvac systems, diy projects, etc. Durable & permanent use: wear-resistant layers, non-slip & endurable. It can maintain flexibility & adhesion, withstand a certain degree of displacement, and deformation. Elongation rate of 1000%, ageing resistance for 30 years. Easy to use: before attaching the tape, keep the target surface clean, dry and oil-free. Peel off the released film and then apply this butyl sealant tape to the surface.

INSTANTLY STOP LEAKAGE: Waterproof and high temperature resistant,