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 10

    REVIEW SNAPSHOT®

    by PowerReviews
    Sikaflex 221 One-Component Adhesive Sealant
     
    4.7

    (based on 10 reviews)

    Ratings Distribution

    • 5 Stars

       

      (7)

    • 4 Stars

       

      (3)

    • 3 Stars

       

      (0)

    • 2 Stars

       

      (0)

    • 1 Stars

       

      (0)

    100%

    of respondents would recommend this to a friend.

    Pros

    • Weather proof (10)
    • Easy to use (8)
    • Protects well (8)
    • Visually pleasing (5)

    Cons

    • Messy (5)

    Best Uses

    • Outdoors (6)
    • Quick fix (3)
      • Reviewer Profile:
      • Casual/ recreational (3), Professional (3)
      • Was this a gift?:
      • No (7)

    Reviewed by 10 customers

    Sort by

    Displaying reviews 1-10

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    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

                  (1 of 1 customers found this review helpful)

                   
                  5.0

                  Stuff was good in 1987, still good now

                  By Leen

                  from Sacramento, CA

                  About Me Casual/ Recreational

                  Verified Reviewer

                  Pros

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

                  Cons

                    Best Uses

                      Comments about Sikaflex 221 One-Component Adhesive Sealant:

                      The instruction video that came with my 1987 convertible BMW showed SikaFlex 221 being used. Looked around online and found JD's website. It's easy to apply, it's easy to mold, and it will stay on for over 20 years like the previous application did. Good stuff, and easy to get at JD's.

                      Displaying reviews 1-10

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