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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 22 Reviews

    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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    March 27, 2018

    the product is what it is, easy to workwith and works as lis
    By KC from South Dakota

    On ordering these items, I have always ordered white from every vendor. When I ordered these I made sure I noted white as color of choice. When I got order they were black in color. Product was coded incorrectly and now I have a case of a product I cant use.

    Bottom Line Yes, I would recommend to a friend

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    September 10, 2015

    Rebeding Deck Screws
    By Cap'n Ed from Toms River, NJ

    Verified Purchase

    Was not packaged well by Jamestown , almost not usable!!!


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