3M™ Marine Adhesive Sealant 5200 Fast Cure is a one-component, high-strength, moisture-curing, gap-filling polyurethane for permanent bonding of aluminum, wood, gelcoat and fiberglass. This fast cure version of 5200 is formulated to typically cure within 48 hours. It chemically reacts with moisture to provide strong, flexible bonds above or below the waterline. - It has a fast cure properties. It forms a watertight, weather-resistant seal on joints and boat hardware, above and below the waterline. In addition, its flexibility allows for dissipation of stress caused by shock, vibration, swelling or shrinking.