TotalBoat Bond Marine Sealant
Sikaflex 221 One-Component Adhesive Sealant
Sika Sika
  • Sikaflex 221 One-Component Adhesive Sealant

Sikaflex 221 One-Component Adhesive Sealant

Sikaflex 221 bonds well to a wide variety of substrates and is suitable for making permanent, high adhesive strength elastic seals. Use 221 on substrate materials wood, metals, metal primers and paint coatings (2c or 2 part systems), ceramic materials and plastics.
 
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Tech Spec Product Info User Generated Content

Sikaflex-221 is a high-quality multi purpose non-sagging 1-component polyurethane sealant that cures on exposure to atmospheric humidity to form a durable elastomer.

Key Features

  • 1-Component Formulation (1C)
  • Elastic
  • Low Odor
  • Resistant to aging and weathering exposure
  • Non-corrosive
  • Can be painted over
  • Can be sanded
  • Bonds well to a wide variety of substrates
  • NSF-approved for incidental food contact and potable water.
  • Sealant type: Polyurethane  Temperature: -40 to 195 F 
    Time until tack free: 60 min  Full cure time: 60 min to 10 days 
    Tensile Strength: 260  Hardness: Shore A 40-45 
    Specific Gravity: 1.27  Elongation: 500% 
    BRAND: Sika
    Material: Polyurethane
    Number Of Parts: One Part
    Type: Adhesive
    Usage: Sealing
    4.8 13

    REVIEW SNAPSHOT®

    by PowerReviews
    Sikaflex 221 One-Component Adhesive Sealant
     
    4.8

    (based on 13 reviews)

    Ratings Distribution

    • 5 Stars

       

      (10)

    • 4 Stars

       

      (3)

    • 3 Stars

       

      (0)

    • 2 Stars

       

      (0)

    • 1 Stars

       

      (0)

    100%

    of respondents would recommend this to a friend.

    Pros

    • Weather proof (13)
    • Easy to use (10)
    • Protects well (10)
    • Visually pleasing (7)

    Cons

    • Messy (5)

    Best Uses

    • Outdoors (9)
    • Quick fix (3)
      • Reviewer Profile:
      • Casual/ recreational (5), Advanced (3), Professional (3)
      • Was this a gift?:
      • No (10)

    Reviewed by 13 customers

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    Displaying reviews 1-10

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    5.0

    Good Goop

    By Bill the Mechanic

    from Philadelphia

    About Me Casual/ Recreational

    Verified Buyer

    Pros

    • Easy to Use
    • Visually Pleasing
    • Weather Proof

    Cons

      Best Uses

      • Outdoor

      Comments about Sikaflex 221 One-Component Adhesive Sealant:

      Used it to put a back window into a convertible.

      Good, but messy, goop.

      • Was this a gift?:
      • No

      (2 of 2 customers found this review helpful)

       
      5.0

      This product really shines

      By Ken

      from Boston, MA

      About Me Advanced

      Verified Buyer

      Pros

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

      Cons

        Best Uses

        • Outdoor

        Comments about Sikaflex 221 One-Component Adhesive Sealant:

        We replaced a bulkhead that butted up against the side of the house. That edge had about a 1/4" crack that needed to be sealed. At first, we tried caulking the edge, but the caulk failed and leaked from the rain and the runoff from the roof. I searched around and found the Sikaflex product which is advertised as a marine sealant. So, I tried using the Sikaflex in place of the caulk. The product worked great. It can fill and seal a much larger crack than caulk can and it has proven to be totally waterproof. It also spreads uniformly and isn't unattractive.

        • Was this a gift?:
        • No

        (2 of 2 customers found this review helpful)

         
        5.0

        I have bought Sikaflex again and again

        By tswan

        from Seattle

        About Me Casual/ Recreational

        Verified Buyer

        Pros

        • Easy To Tool W Soapy Wate
        • Protects Well
        • Weather Proof

        Cons

          Best Uses

          • Outdoor

          Comments about Sikaflex 221 One-Component Adhesive Sealant:

          This was for doing seam along gunwhale. Taped gunwhale and deck using 3M 2090 blue tape and then used a small teaspoon as tool, and gloved finger in tight areas. Used soapy water as tooling agent with great results. Did about 3 foot sections and moved steadily along. When satisfied, pulled up tape immediately. Used alcohol immediately to clean up any accidents. Looks great.

          • Was this a gift?:
          • No

          (2 of 2 customers found this review helpful)

           
          5.0

          Sika above and below

          By CHunter

          from West Hartford, CT

          About Me Professional

          Verified Buyer

          Pros

          • Easy to Use
          • Protects Well
          • Sandable And Paintable
          • Visually Pleasing
          • Weather Proof

          Cons

            Best Uses

              Comments about Sikaflex 221 One-Component Adhesive Sealant:

              Unlike 5200, hardware can be removed without damaging the points of adhesion. While it can be used underwater, it's best uses are for bedding pretty much anything on a boat. As it dries to a rubbery consistency you can even use it to mount pumps to flat dry surfaces, including bilge pumps and float switches. Excess can be left on to dry and then can be trimmed and peels off. It sands very well and can be color matched with your favorite paint.

              • Was this a gift?:
              • No

              (2 of 2 customers found this review helpful)

               
              4.0

              good stuff for elastic seals....

              By healey driver

              from Knoxville, TN

              About Me Advanced

              Verified Buyer

              Pros

              • Easy to Use
              • Protects Well
              • Weather Proof

              Cons

              • Messy

              Best Uses

              • Outdoor

              Comments about Sikaflex 221 One-Component Adhesive Sealant:

              Wish I'd purchased the white version, but this stuff works well as a long term sealant on any application that involves movement. I used it on my RV, and it holds up well against the weather as well as against the motion of a Motorhome in transit.

              • Was this a gift?:
              • No

              (2 of 2 customers found this review helpful)

               
              5.0

              excellent sealer-adhesive

              By healeydriver

              from Rockwood, TN

              About Me Casual/ Recreational

              Pros

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

              Cons

              • Messy

              Best Uses

              • Outdoor

              Comments about Sikaflex 221 One-Component Adhesive Sealant:

              sealed slideout in RV

              • Was this a gift?:
              • No

              (2 of 2 customers found this review helpful)

               
              5.0

              Great product and great service

              By D McC

              from Kansas

              About Me Casual/ Recreational

              Pros

              • Reliable
              • Weather Proof

              Cons

                Best Uses

                  Comments about Sikaflex 221 One-Component Adhesive Sealant:

                  Great waterproofing product. Excellent sales experience.

                  • Was this a gift?:
                  • No

                  (2 of 2 customers found this review helpful)

                   
                  5.0

                  Great

                  By Jsslng

                  from Wilmington, NC

                  About Me Professional

                  Pros

                  • Easy to Use
                  • Protects Well
                  • Weather Proof

                  Cons

                  • Messy

                  Best Uses

                    Comments about Sikaflex 221 One-Component Adhesive Sealant:

                    I actually used this product to seal the sewed seams on my wetsuit. It worked great. Used the left overs on some wooden framed windows on a 37 Elko, still water tight.

                    • Was this a gift?:
                    • No

                    (0 of 1 customers found this review helpful)

                     
                    5.0

                    Great stuff to seal horse trailer roof.

                    By Maître

                    from Oxford, OH

                    Pros

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

                    Cons

                      Best Uses

                      • Outdoor
                      • Quick Fix

                      Comments about Sikaflex 221 One-Component Adhesive Sealant:

                      Used it to seal the aluminum seals on the roof of a Sundowner Horse trailer. It worked great. Using a curved piece of metal to shape and grade the calk in places is a big help.

                      • Was this a gift?:
                      • No

                      (1 of 1 customers found this review helpful)

                       
                      4.0

                      Works as advertised

                      By Bob the handyman

                      from North Carolina

                      About Me Advanced

                      Verified Reviewer

                      Pros

                      • Weather Proof

                      Cons

                        Best Uses

                        • Outdoor
                        • Reseal Horse Trailer

                        Comments about Sikaflex 221 One-Component Adhesive Sealant:

                        Used to reseal an aluminum horse trailer and it worked well. Product was easy to use and dried flexible but firm. Time will tell how the product stands up over time but it has already served the purpose

                        • Was this a gift?:
                        • No

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