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