Sikaflex 291 Tube Black Marine-Grade Polyurethane Sealant 150ml

Sikaflex®-291 Black Marine-Grade Polyurethane Sealant 150mL is a premium, one-component, non-sag adhesive sealant specially formulated for marine environments. It cures on exposure to atmospheric moisture, forming a strong, elastic, and durable bond that resists saltwater, vibration, and weathering. Trusted by boat builders and marine professionals worldwide, Sikaflex®-291 meets International Maritime Organisation (IMO) standards for safety and performance.

Features & Benefits

• Marine-grade polyurethane formula with superior adhesion
• Excellent weathering and saltwater resistance
• Elastic and vibration-resistant for long-lasting seals
• Low odour and non-corrosive composition
• Can be sanded and overpainted after curing
• Maintains flexibility across wide temperature ranges

Where to Use

• Sealing and bonding on boats, yachts, and marine structures
• Deck fittings, hatches, and hardware installations
• Elastic, vibration-resistant joints above and below deck
• Bonding wood, metals, primers, coatings, ceramics, and GRP plastics

Important Notes

• Not suitable for plastics prone to stress cracking such as Plexiglas or Polycarbonate
• Surfaces must be clean, dry, and free from grease or dust before application
• Recommended application temperature: 5°C to 40°C

Technical Details

Chemical Base	1-component polyurethane
Colour	Black
Cure Mechanism	Moisture-curing
Density (uncured)	Approx. 1.3 kg/L
Shore A Hardness	40
Tensile Strength	1.8 MPa
Elongation at Break	500%
Temperature Resistance	-50°C to +90°C (up to 180°C short term)
Skin Time	Approx. 60 minutes
Shelf Life	12 months (stored below 25°C)

Packaging

• 150 mL Tube

For marine sealing and bonding you can trust, Sikaflex®-291 delivers professional-grade strength, flexibility, and durability on every project.