Description Gorilla Waterproof Patch & Seal Tape is a flexible tape which forms a permanent waterproof, airtight* barrier. This waterproof tape can patch holes, cracks, gaps and tears, with a rubberised backing which can be flexed and stretched to fit your surface. Great for: window frames, conservatories, inflatables, pond covers, caravans, trailers, gutters, drainage pipes, roofing, and more! *Reduced if porous material