SIKA Sikaflex-291, Black, Fast Cure Marine Adhesive and Sealant, Polyurethane for Boats, Waterproof, Paintable, 10.1 fl. oz Cartridge

Used this to fill the seam between the hull and deck. Used an electric calking gun allowing for controlled flow into the seams which were 22ft runs from stern to bow. took two tubes of Silkaflex. While fresh it was easy to use a scraper to push this material deeper into the seam and simple to remove excess leaving a smooth seam level with the deck. It took several days to harden to my satisfaction and in the meantime collected a layer of dust onto its surface. Once painted there is a subtle but clear discoloration showing through the paint. It's a good product but as this was a restoration job on a classic wooden boat I think epoxy would have been a better choice. But, no complaints with how this material works and I'm sure it will hold up for some time as the hull and deck flex a bit with movement and with the natural swelling and shrinking inherent in wood.

This is really good RTV! I didn't know Silksflex existed until I had to change out a pair of jet drives on a Zodiac Hurricane. Silksflex RTV was the recommended by the OEM manufacturer. I use Silkaflex on Motorhomes, trucks and around my house. Very strong and flexible and seawater resistant.

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.

Works great , sealed my RV fresh water tanks equalizer hose .

Wonderful, grippy, but gooey to apply - super great adhesion - but absolutely need humidity such as East or West coast, near water, Great Lakes or humid Georgia. I live in Colorado and it is still gooey on my sailboat - called the company - they said need 50-60% humidity or it won't dry. Used in my bathtub and I had to leave hot steaming water in the tube twice and it adhered perfectly. Otherwise would be 5 stars in a humid climate. 2 stars for Colorado - but it's not chemical reaction for drying - it's reactive to humidity.

Works the way it should.

Buy 3m instead. I redid my motorhome bathroom. All the gluing I did with 3 m is still strong and holding after 5 years. Decided to go cheaper and went with Sikaflex and everything i glued didn't last 6 months. It's all fallen down. (shower walls)

Been using it for years in marine carpentry

Expensive for what size. There are other silicones on the market to look into before purchasing Sika Sikaflex 201.

i used it to attach a wood skid strip to the bottom of a small boat. I did use some small screws but the end result showed they weren't neccessary. This is great as a adhesive. The skid can be easily replaced without screws at any time.

J'ai commandé 6 tubes de ce produit dans le blanc. Les tubes reçu étaient tous identifié comme blanc selon les étiquettes sur les tubes mais 1 seul était blanc. Les autres sont tous noir. Le produit semble tout de même être de qualité, j'ai utilisé le blanc pour des endroits visible mais je vais perdre les 5 autres tubes car ce n'est pas la bonne couleur.

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.

As advertised look forward to using in the spring.