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⚓ Seal your leaks, not your plans — marine-grade strength that sticks with you!
Sikaflex 291i White is a professional-grade polyurethane adhesive sealant designed specifically for marine applications. It offers fast curing, strong waterproof bonding, and a clean white finish, making it ideal for both interior and exterior use on boats and other outdoor surfaces. Available in a convenient 300ml cartridge, it’s trusted by professionals and DIY enthusiasts alike to deliver durable, leak-proof seals that stand up to harsh marine environments.
| ASIN | B004X7PEL6 |
| Batteries Required? | No |
| Batteries included? | No |
| Best Sellers Rank | 79,676 in DIY & Tools ( See Top 100 in DIY & Tools ) 20 in Adhesive Caulk |
| Colour | White |
| Customer Reviews | 4.6 4.6 out of 5 stars (3,360) |
| Date First Available | 19 April 2011 |
| Included components | 1 cartridge |
| Item Package Quantity | 1 |
| Item Weight | 414 g |
| Item model number | 291i White |
| Manufacturer | Sikaflex |
| Material | Polyurethane |
| Measurement System | Metric |
| Number of Pieces | 1 |
| Part number | 291i White |
| Pattern | Single |
| Product Dimensions | 4.8 x 4.8 x 23 cm; 414 g |
| Size | 300ml |
| Special Features | Strong |
| Specific uses | Exterior, Inside, Professional, amateur |
| Style | Cartridge |
| Volume | 0.3 Litres |
D**D
A marine quality sealant
Ideal marine quality sealant that will stop those annoying leaks. Easy to apply. Reasonable price. Waterproof.
P**N
Good product and fast delivery
Fast delivery and packed well.
A**R
Ok
This stuff is great for so many boat related jobs! but the biggest issue is it sets solid in the tube!!!! and if you don't use it all at once, it very quickly becomes useless and it's too expensive for that!!!! Perhaps a something to stop this would really help 🤷
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.
K**Y
Great product
This is a great product. Ultra sticky do you have to be careful when applying it, but it does a great job filling, sealing and sticking.
R**E
No nossels
Sikaflex is brilliant, but photo shows nossels yet none supplied adding more expense and hassle to go and buy.
D**N
Top of the range sealant
Great for sealing many areas that require waterproofing in marine situations
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!
B**2
Täta en pool
C**.
Mastice conosciuto per l'uso nautico, lo consiglio.
E**Z
çok teşekkür. Bu ürün hem kaliteli hem hesaplı
A**H
Sikaflex non ha bisogno di recensioni, ottimo sigillante per uso nautico
S**D
Très très efficace
Trustpilot
5 days ago
2 weeks ago