Marine adhesive sealant - black - 296ml - 3M

3M™ 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. This product has been trusted throughout the marine industry for over 50 years.