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on amazon Waterproof Flex Seal Super Strong Adhesive Sealant Tape for Any Surface, Stops Leaks sealant tape : super strong, rubberized, waterproof tape that can patch, bond, seal and repair virtually everything! is specially formulated with a thick, flexible, rubberized backing that conforms to any shape or object! can be applied hot or cold, wet or dry.....even underwater! Tinstantly seals out water, air and moisture to create a super strong, flexible, watertight barrier! comes in black and white and in three sizes: is 4" X 5'. It's extra wide size allows you to quickly cover large cracks, gaps and holes!