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 14

    REVIEW SNAPSHOT®

    by PowerReviews
    Sikaflex 221 One-Component Adhesive Sealant
     
    4.8

    (based on 14 reviews)

    Ratings Distribution

    • 5 Stars

       

      (11)

    • 4 Stars

       

      (3)

    • 3 Stars

       

      (0)

    • 2 Stars

       

      (0)

    • 1 Stars

       

      (0)

    100%

    of respondents would recommend this to a friend.

    Pros

    • Weather proof (14)
    • Easy to use (11)
    • Protects well (11)
    • Visually pleasing (8)

    Cons

    • Messy (5)

    Best Uses

    • Outdoors (10)
    • Quick fix (4)
      • Reviewer Profile:
      • Casual/ recreational (5), Professional (4), Advanced (3)
      • Was this a gift?:
      • No (11)

    Reviewed by 14 customers

    Displaying reviews 1-10

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    5.0

    This stuff is awesome and Jamestown has the best price.....

    By Firewire300 aka VE3OPD

    from EN58 near Duluth MN

    About Me Professional

    Pros

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

    Cons

      Best Uses

      • Engine
      • Indoor
      • Outdoor
      • Quick Fix
      • Wood Trim

      Comments about Sikaflex 221 One-Component Adhesive Sealant:

      This stuff is awesome. If you roughen up the surface it will bond to almost anything. The only thing it is not recommended for is Masonary and Concrete. There are better products like NP1 by BASF. This stuff can be messy but you would expect that and acetone or lacquer thinner takes it off no problem. Any solvent thinner will actually clean it up but acetone or lacquer thinner are the best for cleaning the surface before application because they don't leave any residue. Don't buy more than you need of the 221 but if you have an old tube that the end hardens up on, just poke a hole below the cured area and squeeze it out. Tape over the hole and work your way down the tube. Store in a dry place as this stuff is moisture cured. Needs a couple of days at least before painting over to be safe. Moisture and temperature will determine this. I warm the tube up before using it either in the sun or with a heat gun and it really helps with the flow and application. Heck I use some of this to put part of woodstove door gasket back in place and it is still there. Totally violating what this product is made for. If you had to have one tube of sealant around, this would be the one. Always have a tube in my shop. You will not be disappointed with this product.

      • Was this a gift?:
      • No
       
      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

        (3 of 3 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

          (4 of 4 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

                (4 of 4 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

                      (1 of 2 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

                        Displaying reviews 1-10

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