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 9

    REVIEW SNAPSHOT®

    by PowerReviews
    Sikaflex 221 One-Component Adhesive Sealant
     
    4.7

    (based on 9 reviews)

    Ratings Distribution

    • 5 Stars

       

      (6)

    • 4 Stars

       

      (3)

    • 3 Stars

       

      (0)

    • 2 Stars

       

      (0)

    • 1 Stars

       

      (0)

    100%

    of respondents would recommend this to a friend.

    Pros

    • Weather proof (9)
    • Easy to use (7)
    • Protects well (7)
    • Visually pleasing (4)

    Cons

    • Messy (5)

    Best Uses

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

    Reviewed by 9 customers

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    Displaying reviews 1-9

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    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 1-9

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