TotalBoat Seal Marine Sealant
Sikaflex 291
Sika Sika
  • Sikaflex 291

Sikaflex 291

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.

 
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Tech Spec Product Info User Generated Content
    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
  • Below Water Line (yes/no): Yes
    BRAND: Sika
    Material: Polyurethane
    Rate Of Cure: Fast
    Strength: Good
    Type: Adhesive
    Usage: Bonding
    4.8 12

    REVIEW SNAPSHOT®

    by PowerReviews
    Sikaflex 291
     
    4.8

    (based on 12 reviews)

    Ratings Distribution

    • 5 Stars

       

      (10)

    • 4 Stars

       

      (2)

    • 3 Stars

       

      (0)

    • 2 Stars

       

      (0)

    • 1 Stars

       

      (0)

    100%

    of respondents would recommend this to a friend.

    Pros

    • Weather proof (12)
    • Easy to use (11)
    • Protects well (10)
    • Visually pleasing (9)

    Cons

      Best Uses

      • Outdoors (10)
      • Indoor (4)
      • Quick fix (4)
        • Reviewer Profile:
        • Advanced (6), Recreational (3)
        • Was this a gift?:
        • No (5)

      Reviewed by 12 customers

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      Displaying reviews 1-10

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      5.0

      Perfect sealant

      By DAVIDL

      from WINTERVILLE, NC

      About Me Advanced

      Verified Buyer
      Ensign

      Pros

      • Easy to Use
      • Great viscosity
      • Protects Well
      • Visually Pleasing
      • Weather Proof

      Cons

      • None

      Best Uses

      • Outdoor
      • Seacock Installation
      • Thru Hull Installation

      Comments about Sikaflex 291:

      Use this sealant to install thru hulls and seacocks.

      • Was this a gift?:
      • No
       
      4.0

      USED FOR EXHAUST DUCT ON STERN

      By PEN YAN

      from BOAT IN LAKE ONTARIO

      About Me Casual/ Recreational

      Verified Buyer
      Ensign

      Pros

      • Visually Pleasing
      • Weather Proof

      Cons

        Best Uses

        • Outdoor

        Comments about Sikaflex 291:

        VERY THICK STUFF MAKE SURE ITS WARM BEFORE USE

        • Was this a gift?:
        • No
         
        5.0

        If it's good enough for Marshall Marine.

        By tennesseejed3

        from Stow, MA

        About Me Advanced

        Verified Reviewer

        Pros

        • Easy to Use
        • Protects Well
        • Visually Pleasing
        • Weather Proof

        Cons

          Best Uses

          • Indoor
          • Outdoor
          • Quick Fix
          • Wood Trim

          Comments about Sikaflex 291:

          This stuff is fantastic. Fairly priced and very effective. It sticks and ages very well. I use it mostly for betting deck hardware.

          • Was this a gift?:
          • No
           
          5.0

          Works as described

          By ESM

          from Qatar

          About Me Advanced

          Verified Reviewer

          Pros

          • Easy to Use
          • Protects Well
          • Visually Pleasing
          • Weather Proof

          Cons

          • Messy

          Best Uses

          • Indoor
          • Outdoor
          • Quick Fix

          Comments about Sikaflex 291:

          I use it for trim around any hardware I put on my boat as well as over the bolts to keep down saltwater corrosion.

          • Was this a gift?:
          • No
           
          5.0

          GOOD STUFF!!

          By ADEggman

          from Agua Dulce, California

          About Me Advanced

          Verified Reviewer

          Pros

          • Easy to Use
          • Protects Well
          • Weather Proof

          Cons

            Best Uses

            • Outdoor
            • Wood Trim

            Comments about Sikaflex 291:

            Used this to re-caulk decking on my boat prior to applying deck paint. Sika products are all I use when caulking.

            • Was this a gift?:
            • No

            (1 of 1 customers found this review helpful)

             
            5.0

            Sikaflex for bonding Treadmaster

            By Distant Star

            from Milwaukee, WI

            About Me Advanced

            Pros

            • Easy to Use
            • Visually Pleasing
            • Weather Proof

            Cons

              Best Uses

              • Bonding Treadmaster
              • Outdoor

              Comments about Sikaflex 291:

              Used Sikaflex to bond Treadmaster non-skid material onto a rebuilt bridgedeck. Used a trowel to spread evenly - an easier task than I thought it would be. Sikaflex was less "runny" than I anticipated so clean-up was a breeze as there was little mess.

               
              5.0

              Usages Galore

              By Kandoo Mike

              from San Jose, CA

              About Me Professional

              Verified Reviewer

              Pros

              • Easy to Use
              • Protects Well
              • Visually Pleasing
              • Weather Proof

              Cons

                Best Uses

                • Indoor
                • Outdoor

                Comments about Sikaflex 291:

                Not only for marine applications but for interior as well for bathroom, kitchen, washroom...perfect to keep woods dry from termites. In the trash goes that old hardware store caulking. The reliability and longevity of this caulking is GREAT !!

                (2 of 2 customers found this review helpful)

                 
                5.0

                great fix for plastic boats

                By leaky canoeman

                from Pueblo Co.

                About Me Advanced

                Pros

                • Easy to Use
                • Protects Well
                • Weather Proof

                Cons

                  Best Uses

                  • Coleman canoe repair
                  • Outdoor
                  • Quick Fix

                  Comments about Sikaflex 291:

                  I used it to make a repair on an old coleman canoe. It is as easy to use as silicone, but much more durable. I have been trying different things on this boat for years, and I finally found something that works.

                   
                  5.0

                  Just what we were needing :-)

                  By Dan

                  from Ohio

                  About Me Casual/ Recreational

                  Verified Reviewer

                  Pros

                  • Easy to Use
                  • Protects Well
                  • Visually Pleasing
                  • Weather Proof

                  Cons

                    Best Uses

                      Comments about Sikaflex 291:

                      we knew the type of product we needed but didn't know what we needed... Chatted with someone on line telling them our needs and this was the product that we were looking for...perfect match guys.. the boat is coming along great..standing up under water and still staying fexable... helps seal the screws perfect for what we needed

                      (1 of 1 customers found this review helpful)

                       
                      5.0

                      Sikaflex 291

                      By RonV

                      from Milwaukee

                      About Me Recreational

                      Pros

                      • Easy to Use
                      • Protects Well
                      • Visually Pleasing
                      • Weather Proof

                      Cons

                        Best Uses

                        • Outdoor

                        Comments about Sikaflex 291:

                        Very happy with application and performance...use mineral spirits to clean up.

                        Displaying reviews 1-10

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