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⚓ Seal your success with Sikaflex – where marine meets mastery!
Sikaflex 291i is a premium white silicone-based adhesive sealant designed specifically for marine applications. It offers waterproof, durable bonding and sealing in a convenient 300ml cartridge, compatible with fibreglass and plastic surfaces. Trusted globally for its fast curing and long-lasting performance, it’s the go-to solution for professionals seeking reliable leak protection in demanding environments.

















| ASIN | B004X7PEL6 |
| Best Sellers Rank | 41,048 in DIY & Tools ( See Top 100 in DIY & Tools ) 9 in Adhesive Caulk |
| Brand | Sika |
| Colour | White |
| Compatible Material | Fibreglass |
| Country Of Origin | Switzerland |
| Customer Reviews | 4.6 out of 5 stars 3,481 Reviews |
| Global Trade Identification Number | 07612894815009 |
| Included Components | 1 cartridge |
| Item Dimensions | 48 x 48 x 230 millimetres |
| Item Form | Paste |
| Item Type Name | Sikaflex 291i Multifunctional adhesive sealant for marine applications |
| Item Weight | 0.41 Kilograms |
| Item dimensions L x W x H | 48 x 48 x 230 millimetres |
| Item weight | 0.41 Kilograms |
| Manufacturer | Sikaflex |
| Manufacturer Part Number | 291i White |
| Material | Silicone |
| Model Number | 291i White |
| Number of Items | 1 |
| Style | Cartridge |
| Style Name | Cartridge |
| Surface Recommendation | Plastic, doors |
| Unit Count | 300.0 millilitre |
| Water Resistance Level | Waterproof |
| Water resistance level | Waterproof |
S**T
Blimey, this is proper sticky!
Problem. Modern close couple WC, syphon is glued in place, within cistern, but starts leaking, adhesive has broken down prematurely. Most silicone sealants are not suitable for full immersion, fish tank sealant not readily available locally. Solution. Marine sealant. Sikaflex products are very good, as I have used automotive sealants before. Its not expensive, by comparison to high performance silicone. It is hard to squeeze out with a gun, next time I'd probably warm it up a little. Once cured, job seems to be done. I have used it for a number of other of little leaky bits, here and there. Would imagine it would be put to a whole range of waterproofing and sealing tasks. so yes, a recommendation.
D**D
A marine quality sealant
Ideal marine quality sealant that will stop those annoying leaks. Easy to apply. Reasonable price. Waterproof.
D**E
How to use the product
It does the job of an adhesive very well, however because of its consistency it does seem next to impossible to apply using the usual gun nozzle, it may help to warm the tube, the other downside is that there are no English instructions on the tube, but they can be found online, be careful to seal the tube if you want to use it again as it will set in the tube outlet, it is a very good product and I would recommend it.
S**G
Works perfectly
The ONLY sealant that works perfectly on a boat.
P**N
Good product and fast delivery
Fast delivery and packed well.
D**L
Great for waterproofing cars and even boats!
This is the best waterproof sealant around, I did a lot of research as my partners car was letting in a small amount of water around one of the seals which had come off, and this was universally recommended for repairs and sealing, used heavily by the boating community who know what they are talking about. It's not cheap, but worked perfectly, a single application and the issue was fixed, great adhesion and completely waterproof once cured. Recommended!
E**.
By far the best marine sealant for deck fittings, hatch seals etc.
I've had a problem with a leaking roof box on my barge. I've used Sikaflex products before but hadn't tried this one specifically. Easy enough to apply, cures pretty quickly and creates a very durable and tight seal. I'll be experimenting with other uses for this as I think it'll likely replace several other sealants I use regularly. Highly recommended for any marine applications.
R**E
No nossels
Sikaflex is brilliant, but photo shows nossels yet none supplied adding more expense and hassle to go and buy.
S**N
Mastic marine fiable et flexible, qualité Sikaflex garantie
Excellent mastic marine polyuréthane Sikaflex 291i. La tenue à l'eau est excellente, parfait pour les applications en milieu humide et marin. La flexibilité élevée permet d'absorber les vibrations sans se fissurer. Sans solvant, il peut être peint une fois sec. L'application est facile et le produit adhère bien à la plupart des surfaces (bois, métal, plastique, fibre de verre). Très bon produit SIKA comme toujours.
S**O
ottimo prodotto
Sigillante/mastice marino con una buona lavorabilità. Si attacca benissimo alle superfici e si spalma facilmente. Vedremo la durata nel tempo. Attenzione: utilizzare guanti e protezioni perchè non va via dalla pelle se non dopo diversi giorni
B**2
Perfekt
Täta en pool
C**.
Ottimo
Mastice conosciuto per l'uso nautico, lo consiglio.
E**Z
güzel ve kaliteli ürün
çok teşekkür. Bu ürün hem kaliteli hem hesaplı
Trustpilot
1 week ago
3 weeks ago