Sikaflex 291 Marine Adhesive / Sealant – White, 11 oz. Cartridge (884-291WH)
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Sikaflex 291 Marine Adhesive / Sealant – White, 11 oz. Cartridge
Sikaflex 291 is a one-component, moisture-curing polyurethane adhesive and sealant built for demanding marine environments. The 11 oz. cartridge format is the standard choice for deck hardware installation, portlight sealing, and general above-waterline bonding jobs where a full tube of material is needed. It cures to a flexible, watertight seal that holds up to vibration, UV exposure, and constant moisture without cracking or shrinking.
Formulated with low viscosity and medium modulus, Sikaflex 291 flows smoothly into joints and gaps, bonds to a wide range of substrates, and remains paintable after cure.
Compatible Applications
- Deck hardware installation (cleats, hatches, fittings, stanchion bases)
- Through-hull fittings and port sealing
- Cabin windows and portlights
- Teak and non-skid deck seams
- General above-waterline bonding and sealing
- Fiberglass, wood, metal, and most painted surfaces
Key Features
- One-component — no mixing required
- Moisture-activated, fast cure
- Low viscosity for smooth application and gap-filling
- Medium modulus — flexible yet strong bond
- Paintable after cure
- Resistant to UV, saltwater, and fuel splash
- 11 oz. (310 ml) standard cartridge — fits standard caulking guns
- SKU: 884-291WH
Related Products
- Sikaflex 291 White – 70 ml Mini Sausage (single-use / tight-space format)
- Sikaflex 291 LOT White – 11 oz. Cartridge (Low Odour/Tack formula)
- Sikaflex 291 Black – 11 oz. Cartridge
- Sikaflex 292 Polyurethane – White, 10.3 oz. Cartridge (structural grade)
- Sikaflex 205 Primer – 250 ml (for porous or difficult substrates)
Parts Desk Insights
The 11 oz. cartridge is the best all-around format for Sikaflex 291 — it covers most deck hardware installs, portlight reseals, and fitting jobs without running short. For single-use or precision work in tight spaces, the 70 ml mini sausage reduces waste. If low odour during application is a priority — particularly for enclosed spaces — consider the 291 LOT formula. For structural bonding applications requiring higher strength, step up to Sikaflex 292. Pair with Sikaflex 205 Primer on porous or difficult substrates for maximum adhesion.
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.