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3M™ Marine Grade Silicone Sealant is a high-quality silicone designed for the harsh marine environment. The 3M™ Marine Grade Silicone Sealant helps to form a mildew-resistant, non-yellowing seal that remains flexible even after years of exposure. It's designed to provide excellent resistance to the marine environment and adheres to bare and painted metal, fibreglass, glass, non-oily woods and many plastics.