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Product Details

Sika 291 is a Professional grade Marine Adhesive/Sealant used by boat builders and yards to bond and bed boat components structurally. Fast strength build-up overnight. Use above and below the waterline. Comes with nozzle. All purpose adhesive sealant, bond to hull & structural members. Bedding Compound, light bonding, fast cure polyurethane sealant.

NOTE: SIK-291201W is a 20oz. Sausage Pack, which is NOT compatible with standard caulking guns.

Info & Guides
    Technical Specifications
  • Density: 10.3 lbs per gal
  • Tack Free Time: 60 min.
  • Rate of Cure: 1/4-in x 1/4-in bead 9 days at 40F/30% R.H.
    1/4-in x 1/4-in bead 4 days at 73F/50% R.H.
    1/4-in x 1/4-in bead 3 days at 73F/70% R.H.
    1/4-in x 1/4-in bead 1 day at 100F/75% R.H.
  • Shore A Hardness (ASTM D2240): 45-50
  • Elongation at Break (ASTM D412): >600%
  • Tensile Strength (ASTM D412): 221 PSI
  • Lap Shear Strength (ASTM D1002): 165 PSI
  • Peel Strength: 35 lbs/in on fiberglass, 25 lbs/in on gelcoat
  • Application Temperature: 40F to 110 F
  • Service Range: -40F to 190 F
  • Color: Black, White
  • Sandable, paintable and is waterproof
  • Reviews for Sikaflex 291

    10 of 24 Reviews

    July 12, 2022

    Excellent Caulk
    By Robert from Moriches, Long Island, NY

    Verified Purchase

    This is an excellent caulk, and a light duty adhesive. I like that it's not permanent like other 3M caulks. However, this stuff makes a great seal between surfaces, and really keeps out the water. Quite sticky though, and you need mineral spirits to clean up. The only thing I don't like is using half the 10 oz tube, because by the time I need it again, it hardens up in the tube and the nozzle within a few days. Fortunately they do sell this in 3 oz tubes, that have a screw cap, since I use this in small quantities.

    Bottom Line Yes, I would recommend to a friend

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    May 9, 2022

    I will use it again!
    By Ov from Peconic, NY

    Verified Purchase

    Using it on below water-line seams on a1936 Chris Craft cruiser. Easy to work with but MUST use latex or vinyl gloves, long sleeves, etc. It can get quite messy! Found it to be sandable after curing, very helpful in fairing rough bottom areas.

    Bottom Line Yes, I would recommend to a friend

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    September 28, 2020

    Great to use when building a wooden boat
    By JFOKie from Dover, NH

    Verified Purchase

    I used this while building a 16' skiff. It's easy to work with and flexible. Highly recommend.

    Bottom Line Yes, I would recommend to a friend

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    June 26, 2020

    Stuff sticks to everything
    By Jim from Cleveland, ohio

    Verified Purchase

    Used this for sealing thru hull bolts and other fittings. Seals great. Wear gloves.

    Bottom Line Yes, I would recommend to a friend

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    June 17, 2020

    Good sealant with many applications
    By Dave F from Tiverton RI

    Verified Purchase

    Great product for bedding and sealing hardware above and below the waterline. A good medium strength polyurethane and comes in colors. It doesn't have any UV propertiesand if that's a requirement pay to exposed aera with a UV sealant.

    Bottom Line Yes, I would recommend to a friend

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    May 22, 2020

    GREAT STUFF..... EASY TO APPLY.....
    By FRANK from Punta Gorda FL

    Verified Purchase

    GREAT STUFF..... EASY TO APPLY.....HIGHLY RECOMMENDED

    Bottom Line Yes, I would recommend to a friend

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    July 30, 2018

    It worked
    By Boats from Cranberry Lake, NY

    Verified Purchase

    Sealed my instrument panel from the weather. Waiting to see when I remove the panel will it be easy to remove

    Bottom Line Yes, I would recommend to a friend

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    July 16, 2018

    Like the product
    By Bob from Rochester, ny

    Verified Purchase

    I wish JD offered the option of shaking the paints they sell.

    Bottom Line Yes, I would recommend to a friend

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    June 4, 2018

    Excellent Product
    By Captain Nemo from Lyons, NY

    Verified Purchase

    Used this on underwater seams where the plank ends meet the transom. Really good adhesion, very flexible. I'll use this wherever I used to use Life- Caulk, much better. I fully recommend this for bedding fixtures and hardware also. Good stuff!

    Bottom Line Yes, I would recommend to a friend

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    April 9, 2018

    Good Sealant
    By Aqua Therapy from Orange Beach, AL

    Great for sealing deck fuel hatches.

    Bottom Line Yes, I would recommend to a friend

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