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3M Marine Grade Silicone Sealant (Clear) is a mildew-resistant, non-yellowing silicone that stays flexible for long-term marine sealing above the waterline. It adheres to common boat-building surfaces including metal, fiberglass, glass, non-oily woods, many plastics, and abraded rubbers.
Best Use Case: Use this clear marine silicone sealant when you need a mildew-resistant, non-yellowing seal that will remain flexible on typical boat surfaces (especially above the waterline) such as around head/galley openings and other sealing joints.
Common Issues: For best results, start with clean, dry, properly abraded surfaces where neededadhesion is strongest when mating areas are free of contaminants. If youre sealing dissimilar materials (e.g., metal to plastic), confirm the surfaces are prepared correctly and use the sealant consistently along the joint to avoid gaps that can admit moisture.
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