Sikaflex®-291 LOT White is a one-component marine-grade polyurethane adhesive and sealant designed for demanding water-exposure environments. It's ideal for boat-building and marine maintenance projects where you need time to position components without sacrificing elasticity.
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Color: White
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Container: 3 oz tube with nozzle
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Type: 1-component polyurethane adhesive and sealant
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Moisture-cured: Yes
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Open time: Long—extended working time for precise placement
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Non-sag formulation: Maintains performance on vertical surfaces and overhead joints
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Applications: Above and below the waterline; general marine bonding and sealing for hulls, decks, joints, and fasteners
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Performance: Resists saltwater and remains permanently elastic to absorb movement
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Finish compatibility: Paintable and sandable
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Certifications: NSF approved for potable water; USDA approved for incidental food contact
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Manufacturer: Sika
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Manufacturer Part No: 610564
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UPC: 033886130646
Its long open time gives you a generous working window to align parts before curing, while the non-sag formula keeps the sealant in place on vertical surfaces. The product remains permanently elastic to absorb marine movement and vibration, helping prevent leaks as hulls flex. Compatible with coatings and finishes for a seamless professional look, it’s suitable for both above- and below-waterline applications. The NSF potable-water certification and USDA incidental food-contact approval add versatility for vessels with potable-water systems and food-contact areas.
