AquaFlex Clear Underwater Pool Leak Sealant Kit DMK-C8100 by AquaBond AquaFlex Clear Underwater Sealant Kit DMK-8100 for Swimming Pools and Spas by AquaBond Invisibly seals leaks, tears and cracks in gunite, shotcrete, fiberglass and vinyl swimming pools, spas and water features Easily mixes, applies and cures underwater - No need to drain the pool! New, Patent Pending application process! Won't break down in sunlight or chlorine Better than silicone caulk