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⚓ Seal your marine projects with confidence — fast, tough, and built to last!
Sikaflex-291 is a black, one-part polyurethane marine adhesive and sealant designed for fast curing and superior water resistance. Ideal for flexible, vibration-resistant joints on boats and marine structures, it bonds multiple materials and withstands harsh saltwater, fuel, and oil exposure. Delivered in a convenient 10.1 fl oz cartridge, it meets international maritime standards and offers a sandable, paintable finish for professional-grade results.
| ASIN | B00C501KD4 |
| Amazon Bestseller | #170,405 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #17,363 in Adhesives & Sealants |
| Brand Name | SIKA |
| Color | Black |
| Compatible Material | Aluminum |
| Container Type | Cartridge |
| Customer Reviews | 4.3 4.3 out of 5 stars (469) |
| Full Cure Time | 24 Hours |
| Global Trade Identification Number | 00033886005272 |
| Included Components | Sealant |
| Item Form | Gel |
| Item Package Quantity | 1 |
| Item Weight | 10.1 Ounces |
| Manufacturer | Sika USA |
| Material Type | Polyurethane |
| Model | 90923 |
| Other Special Features of the Product | Water Resistant |
| Specific Uses For Product | Marine |
| UPC | 033886005272 |
| Unit Count | 10.1 Count |
| Viscosity | High Viscosity Paste |
| Volume | 10.1 Fluid Ounces |
| Water Resistance Level | Waterproof |
B**R
I bought this Sika 291 to repair an aluminum canoe. This marine urethane is basically the same thing that SportsPal sells in their repair kit. I haven't used it yet but based on other reviews it will be fine for the repair I set out to accomplish Regarding other reviewers stating they received out of date or wrong colour product, I ordered black and got black and the use by date was 9 months into the future (July 2025) beyond my purchase date Nov/2024.
R**W
Each type of caulk has its own purpose and this is not structural quite obviously. I like the fact that It can be above or below the waterline but I would not ever use this below the waterline. As I suspected there are better ways; that said knowing that they don't have a problem with it being underwater makes me feel a lot better about it being above water on my deck. Acting as a sealant.
M**O
Works the way it should.
A**R
It has worked well but they sent me the wrong colour and hubby did not read it before opening it.
Y**B
Received very old, dry product with expiry date in only a few months. Typically these have several years of shelf life left.
Trustpilot
1 week ago
1 day ago