Can effectively repair damage to PVC, copper, ceramic, fiberglass, concrete, and most metals, plastics and rubbers. Syntho-Glass can be used underwater by divers and is one of the best products around for pipe repair. To figure out how much Syntho-Glass you need: (3.14 x diameter of pipe/ width of Syntho-Glass) x number of layers required x length of pipe = ft. req'd Please call for other products from the manufacturers of Syntho-Glass.