3M 5203 Marine Adhesive Sealant 5200, 3Oz, White3M Marine Adhesive Sealant 5200 is a one component, high strength, moisture curing, gap filling polyurethane for permanent bonding of wood, gelcoat and fiberglass. It cures to form a firm, rubbery, waterproof seal on joints and boat hardware, above and below the waterline. Permanent bonding above and below the waterline Offers extended working time Achieves handling strength in 48 hours Tough and flexible polyurethane polymer forms strong bonds
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