Sikaflex 291BK Marine Polyurethane Adhesive / Sealant – Black, 11 oz. Cartridge
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Sikaflex 291BK – Marine Polyurethane Adhesive & Sealant, Black
Sikaflex 291BK is a one-component, moisture-curing polyurethane adhesive and sealant built for the demands of the marine environment. Its low-viscosity formula flows readily into joints and irregular surfaces, curing to a durable, flexible, waterproof seal that holds up against UV exposure, saltwater, and constant vibration. The black colour integrates cleanly with dark hull sides, black hardware, teak trim, and rubber components where white or grey would stand out.
Key Features
- One-component — no mixing, ready to apply
- Fast cure, medium modulus — flexible bond that moves with the boat
- Low viscosity — penetrates tight joints and uneven surfaces
- Excellent adhesion to fibreglass, wood, metals, and most plastics
- Resistant to UV, saltwater, fuel splash, and weathering
- Paintable after full cure
- Black colour — suits dark hardware, teak trim, and black hull accents
Compatible Applications
- Deck hardware bedding (cleats, fairleads, stanchion bases, pad eyes)
- Through-hull fittings and port lights
- Hatches, portlights, and windshield frames
- Teak trim and dark-coloured hardware installations
- General above-waterline sealing and bonding on dark surfaces
- Aluminum and stainless steel fittings where black finish is preferred
Parts Desk Insights
The black variant is the go-to choice for installations on dark hulls, black hardware, and teak-trimmed surfaces where white or grey sealant would create an unwanted colour contrast. It’s also commonly used for through-hull fittings and portlights on dark-coloured boats. For the same formula in a different colour, see Sikaflex 291GR (Grey) or Sikaflex 291WH (White). For a smaller single-use quantity, the 291BK 70 ml Mini Sausage avoids wasted product on small jobs. For UV-critical glazing or window bonding, step up to Sikaflex 295UV.
Related Products
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.