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
    4.7 11

    REVIEW SNAPSHOT®

    by PowerReviews
    Sikaflex 221 One-Component Adhesive Sealant
     
    4.7

    (based on 11 reviews)

    Ratings Distribution

    • 5 Stars

       

      (8)

    • 4 Stars

       

      (3)

    • 3 Stars

       

      (0)

    • 2 Stars

       

      (0)

    • 1 Stars

       

      (0)

    100%

    of respondents would recommend this to a friend.

    Pros

    • Weather proof (11)
    • Protects well (9)
    • Easy to use (8)
    • Visually pleasing (5)

    Cons

    • Messy (5)

    Best Uses

    • Outdoors (7)
    • Quick fix (3)
      • Reviewer Profile:
      • Casual/ recreational (4), Professional (3)
      • Was this a gift?:
      • No (8)

    Reviewed by 11 customers

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    Displaying reviews 1-10

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    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
       
      5.0

      Sika above and below

      By CHunter

      from West Hartford, CT

      About Me Professional

      Verified Buyer
      Ensign

      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
           
          4.0

          good stuff for elastic seals....

          By healey driver

          from Knoxville, TN

          About Me Advanced

          Verified Buyer
          Ensign

          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
           
          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
           
          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
               
              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
                     
                    4.0

                    Great Product

                    By Northstar

                    from Tunnel Hill Ga

                    About Me Beginner

                    Verified Reviewer

                    Pros

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

                    Cons

                    • Messy

                    Best Uses

                    • Outdoor
                    • Quick Fix

                    Comments about Sikaflex 221 One-Component Adhesive Sealant:

                    *This product was used to fix rear glass window on convertible.

                    *Its Works!!!

                    *Messy, but easily clean up with acetone solvent

                    (1 of 1 customers found this review helpful)

                     
                    5.0

                    excellent adhesive caulk; sticks to all

                    By Jim Z

                    from Monroe, NC 28112

                    About Me Professional

                    Verified Reviewer

                    Pros

                    • Easy to Use
                    • Excellent adhesion
                    • Protects Well
                    • Weather Proof

                    Cons

                    • Cleanup immediately
                    • Messy

                    Best Uses

                    • Indoor
                    • Outdoor
                    • Quick Fix
                    • Windows roofing

                    Comments about Sikaflex 221 One-Component Adhesive Sealant:

                    I use this product for a number of high end residential house construction projects. Bonding and waterproofing are its best qualities. It is a ureathane caulk so it is a little messy and any caulk that gets away needs to be cleaned/wiped up immediately to keep from getting onto everything. The product is better for cleanup and smoothing out then older formulas of Sikaflex caulk. Great product. I use a fair amount of it.
                    Jim Zynsky
                    Comfort Green Buildings
                    Monroe, NC 28112

                    Displaying reviews 1-10

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