Sika Sikaflex® 291 Fast Cure Adhesive & Sealant 10.3oz(300ml) Cartridge - White

Sikaflex® 291 Fast Cure Adhesive & Sealant is a 1-component marine-grade polyurethane elastomeric adhesive and sealant specifically engineered for the demands of boat construction and repair. This 10.3oz (300ml) cartridge delivers the fast cure time that marine professionals depend on when speed and reliability cannot be compromised. Whether you're bonding fiberglass hulls, attaching fittings to gelcoat, or sealing critical joints, Sikaflex® 291 combines strong initial grab with excellent long-term durability in saltwater environments.

The fast cure formulation makes Sikaflex® 291 ideal for production boat builders and service yards where downtime directly impacts throughput. The polyurethane chemistry provides superior adhesion to gelcoat, fiberglass, metals, and composite materials commonly found in marine construction. The white color blends seamlessly with light-colored hulls and deck components. As a moisture-cure polyurethane, the sealant hardens through exposure to ambient humidity, allowing users to control application timing without complex mixing or multiple components. Once cured, it maintains flexibility and resists the UV degradation and thermal cycling that accelerates failure of rigid adhesives in marine service.

Sikaflex® 291 serves a broad audience across the boating community—from weekend fishermen repairing transom joints and securing console fittings, to serious offshore anglers reinforcing structural connections exposed to constant water immersion and engine vibration. Boat builders use it for hull-to-deck bonding, window frame installation, and rudder assembly. The cartridge format works with standard caulking guns, making application straightforward in confined spaces typical of marine repair work. This product is equally suited for light-duty structural bonding and general sealing applications where fast fixture and proven marine durability are essential.