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Sika-Flex 291 Medium Strength Marine Adhesive Sealant is a multifunctional polyurethane-based adhesive sealant for marine applications above or below the waterline. It is formulated for the marine environment, and is a non-sag, single-component sealant that cures on exposure to atmospheric moisture. This formula is resistant to weathering, seawater and ultra-violet radiation, but will yellow if exposed to the sun.