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Sika Sikaflex-221 - Black - Multi-Purpose Polyurethane sealant/Adhesive - Creates Permanent Elastic Seal - Sandable/paintable - Non-Corrosive - 10.1 fl oz

4.5 4.5 out of 5 stars 2,294 ratings
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Black
Compact
Material Polyurethane
Brand SIKA
Style Compact
Item Weight 10.1 Ounces
Item dimensions L x W x H 12 x 2 x 12 inches

About this item

  • VERSATILITY AND QUALITY IN ONE - Sometimes simply called Sika 221 black, this one-component urethane caulk bonds to a range of substrates, including metals, plastics, and metal primers and coatings
  • AGE RESISTANT - Formulated to resist the effects of aging to better perform at peak capacity no matter the conditions. Also resists elements such as seawater, diluted acids, and caustic solutions
  • READY TO USE - The Sikaflex black sealant comes in a handy cartridge that fits easily on an electric, pneumatic or manual application gun, making accurate placement of adhesive paste quick and easy
  • SAFE AND EFFECTIVE - Approved by the NSF for use in both drinking water systems and food production operations, so you can rest easy knowing there's no harmful level of chemicals
  • PERFECT FOR INTERNAL SEALS AND BONDING - Use it for permanent seals that you can rely on. The paste also bonds to ceramic materials and cures quickly upon exposure to atmospheric moisture
› See more product details
Note: Products with electrical plugs are designed for use in the US. Outlets and voltage differ internationally and this product may require an adapter or converter for use in your destination. Please check compatibility before purchasing.

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SIKA USA
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  2. Sika

    Sika is a specialty chemicals company with a leading position in the development and production of systems and products for bonding, sealing, damping, reinforcing, and protecting in the building sector and motor vehicle industry. Sika has subsidiaries in 101 countries around the world and manufactures in over 300 factories. Its more than 27,000 employees generated annual sales of CHF 9.3 billion in 2021.

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  6. Sika Pro Select

    For over 20 years, Sika has offered pro contractors and DIY'ers the same superior performing products developed and used on the most spectacular projects throughout the world. Our Sika Pro Select product range encompasses a wide array of specialty construction products from sealants and adhesives to patchers and expanding foams. From job site to store shelf, Sika ensures that you have everything you need for your everyday projects.

  7. Sika
  8. Sika
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    Sikaflex Crack Flex Sealant, Gray, High performance, textured polyurethane sealant, self-leveling...
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    SIKA - 91016 Sikaflex 1a Polyurethane Sealant, 10.1 fl. oz. Cartridge, Limestone

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From the manufacturer

Sikaflex 221
Sikaflex 221
Sikaflex 221

Sikaflex 221

Sikaflex 221

Sikaflex 221

Sikaflex-221 Sikaflex-291 Sikaflex-291 LOT 1A CS ISA
RV/Trailer Sealant & Adhesive Marine Sealant & Adhesive Marine Sealant & Adhesive Polyurethane Sealant & Adhesive Construction Sealant Insulation Sealant & Adhesive
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Customer Reviews
4.5 out of 5 stars
2,294
4.4 out of 5 stars
1,117
4.3 out of 5 stars
273
4.3 out of 5 stars
567
4.5 out of 5 stars
715
4.4 out of 5 stars
118
USE Sealant & Adhesive Fast cure sealant & adhesive for boats Sealant & adhesive for boats Sealant & Adhesive All purpose non-sag sealant Bonds to insulation boards
APPLICATION Wood, metals, primers, ceramic Gelcoat, fiberglass, metal & wood Deck, interior, fittings, vent Joints, fillets, windows & more Wall, floor, trim, window, door PVC, metal, wood, stone, glass
ADVANTAGES Elastic, non-corrosive, paintable Fast cure, paintable, excellent bond Long open time, paintable, sandable Odorless, jet fuel resistant Flexible, paintable, resistance UV stable, non corrosive, durable
COLORS White, Black, Aluminum Gray Black, White Black, White, Mahogany White, Limestone White, Limestone White, Dark Bronze
PACKAGING 10.1 fl. Oz 3 fl oz, 10.1 fl oz 10.1 fl. Oz 10.1 fl. Oz 10.1 fl. Oz 9 fl.oz.

Product Description

Sikaflex-221 is a high-quality multi-purpose non-sag 1-c polyurethane sealant/adhesive that cures on exposure to atmospheric humidity to form a durable elastomer. Sikaflex-221 bonds well to a wide variety of substrates and is suitable for making permanent elastic seals of high adhesive strength. Suitable substrate materials are wood, metals, metal primers and paint coatings (2-c systems), ceramic materials and plastics.

Product information

Technical Details

Additional Information

Warranty & Support

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Sika Sikaflex-221 - Black - Multi-Purpose Polyurethane sealant/Adhesive - Creates Permanent Elastic Seal - Sandable/paintable - Non-Corrosive - 10.1 fl oz

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What's in the box

  • AP Products 017-90893 Sikaflex-221, Black

    • Product guides and documents

    Certificate of Compliance (PDF)
    Safety Information (PDF)

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    Looking for specific info?

    Customer reviews

    4.5 out of 5 stars
    2,294 global ratings

    Customers say

    Customers appreciate the sealant's functionality, adhesion, and ease of use. They find it works well on windows, doors, flashing, and autobody seam sealers. The product adheres well and sticks together tightly. It sets quickly and is durable, holding up well over time. Many customers are satisfied with the sealant's performance and durability. However, some received the wrong color, which was grey or white instead of black as requested.

    AI-generated from the text of customer reviews

    Select to learn more
    FunctionalityAdhesionEase of useDurabilitySealantValue for moneyColor accuracyDifficulty to remove
    103 customers mention "Functionality"83 positive20 negative

    Customers like the sealant's functionality. It works well for windows, doors, flashing, and autobody seam sealing. They say it goes a long way and is perfect for various projects. However, some customers mention that Amazon doesn't label the colors correctly.

    "Works just as described, used it to fill leak gaps in cinderblock wall, went on well and the paint I applied after it dried went on well as well...." Read more

    "...It worked great. It flowed smooth, but did not sag when applied at an angle. It dried to a nice firm consistency and should outlast the car." Read more

    "The product is great. But beware of what they ship. The first time I ordered it. It came correctly. WHITE. The second time I ordered it...." Read more

    "It’s perfect for various projects. The white finish looks clean and professional." Read more

    39 customers mention "Adhesion"33 positive6 negative

    Customers like the sealant's adhesion. They say it sticks things together well, is a strong elastic sealer adhesive, and is easy to apply. The sealant is convenient for various purposes and secures panels.

    "...This a high quality strong elastic sealer adhesive. Once dry and cured its strong. Relatively low odor. Highly recommend." Read more

    "...I’ve used it on multiple surfaces, and it adheres beautifully every time!" Read more

    "Works for anything you want sealed up tight. Sticks great" Read more

    "It’s a fast-curing polyurethane sealant that’s easy to apply and adheres well." Read more

    31 customers mention "Ease of use"22 positive9 negative

    Customers find the sealant easy to use. It adheres well, sets quickly, and is resistant to UV rays. They say it goes on easily, sets completely in the presence of heat, and one tube goes a long way.

    "It’s a fast-curing polyurethane sealant that’s easy to apply and adheres well." Read more

    "...Reliable and easy to use." Read more

    "...Huge mess, nasty cleanup, extremely wasteful. I like the product inside but the container is garbage...." Read more

    "...It worked well and was easy to apply." Read more

    25 customers mention "Durability"25 positive0 negative

    Customers appreciate the sealant's durability. They say it holds up well, is flexible, and won't crack or peel. The repair is strong and should outlast the car. Customers also mention it's waterproof and tough once it cures.

    "...Solid product, would buy again." Read more

    "...It dried to a nice firm consistency and should outlast the car." Read more

    "...This a high quality strong elastic sealer adhesive. Once dry and cured its strong. Relatively low odor. Highly recommend." Read more

    "...This stuff is really tough and is useful as a super strong adhesive and sealant." Read more

    20 customers mention "Sealant"20 positive0 negative

    Customers like the sealant. It works well for sealing around windows and cracks on campers. They say it adheres well and stops leaks.

    "...stuff is really tough and is useful as a super strong adhesive and sealant." Read more

    "...I use it as a cheap seam sealer anyways in certain locations, seals awesome. Recommended" Read more

    "This stuff is incredible , goes on easily, seals window frames on RVs perfectly. Water tight ...." Read more

    "...It went down nicely and seems likely to seal well for many years...." Read more

    15 customers mention "Value for money"10 positive5 negative

    Customers have different views on the sealant's value for money. Some say it's a good product at a great price, while others consider it not a good deal and would not buy again.

    "...I would assume it’s a decent price, I just don’t have anything to compare to. Would definitely buy again.. and have." Read more

    "Goes a long way. Quality stuff. Great price." Read more

    "Not cheap, but it is worth the money. Used it to mount a solar panel to the top of my travel trailer. Went on a 1800 mile trip...." Read more

    "...A very good investment." Read more

    33 customers mention "Color accuracy"8 positive25 negative

    Customers are unhappy with the color accuracy of the sealant. They mention it's white instead of black, the actual color was grey, and Amazon doesn't label the colors correctly. Upon application, the caulk appears off-white. Wine discolors the white color, even after cured for a week before use. The tubes were mislabeled white when they were really black.

    "The “white” color sold is not white. It is GREY." Read more

    "...And find when opening it.It is GREY!!! On top of that I tried to replace it...." Read more

    "This is a great product but unfortunately the tubes were mislabeled white but are really black." Read more

    "...Tacky when applied such that no tape required to affix metal to glass. So far so good! Easy alcohol cleanup until it dries." Read more

    18 customers mention "Difficulty to remove"0 positive18 negative

    Customers find the sealant difficult to remove from the tube. They say it spreads easily and is hard to get out of the tube. Some customers had to delay their projects because the product wouldn't come out.

    "...Even after half an hour or so it is hard to remove and remain on your hands for a week or so...." Read more

    "It has a nice consistency, but it is almost impossible to get it out of the tube.I wished it was a bit thinner...." Read more

    "...It can be tough to remove but with some solvent you just take a little at a time an it eventually comes loose...." Read more

    "...instructions and wear gloves to keep it off your skin, it is difficult to remove." Read more

    Re-caulk the roof of my Airstream
    5 out of 5 stars
    Re-caulk the roof of my Airstream
    I made the decision to replace the bedroom vent with a Fantastic-fan. While up there, I noticed how horrible all of 2003/original caulk was. I purchased this SIKA for the rain/water channel running each side of the camper. I bought Dicor 501 for around the Fans, TV and Radio antennas. (not an expert just a regular Joe), The first tube had some damage so it was returned and quickly replacement (thank you Amazon). The next tube was perfect and ready for use. I will say, this is a little harder to use than the Dicor but I also believe they are two different products for two different uses. You better have strong forearms and grip b/c this stuff comes out slower and stiffer :) as a result it will stay where you put it and wont self level. Clean up wasn't that bad but my clothing might be another story. (Would I buy it again....absolutely)
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    Top reviews from the United States

    John
    5.0 out of 5 stars Works great!
    Reviewed in the United States on November 28, 2024
    Color: WhiteStyle: CompactVerified Purchase
    Works just as described, used it to fill leak gaps in cinderblock wall, went on well and the paint I applied after it dried went on well as well. Solid product, would buy again.
    Helpful
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    Skid22
    5.0 out of 5 stars Worked great for sealing fender supports
    Reviewed in the United States on October 15, 2024
    Color: BlackStyle: CompactVerified Purchase
    This was recommended to use to fill a gap in the front fender supports of a 60's Jaguar. It worked great. It flowed smooth, but did not sag when applied at an angle. It dried to a nice firm consistency and should outlast the car.
    2 people found this helpful
    Helpful
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    Robert D.
    5.0 out of 5 stars Excellent product
    Reviewed in the United States on November 21, 2024
    Color: BlackStyle: CompactVerified Purchase
    Are use this as a seam sealer, it will spread nicely if you take your time, but don’t take too long, manufacturer says it sandal I don’t believe you can. I would purchase again.
    One person found this helpful
    Helpful
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    Michael Binder
    5.0 out of 5 stars This is great stuff - Apply with care
    Reviewed in the United States on July 16, 2024
    Color: WhiteStyle: CompactVerified Purchase
    I used this to reseal the inner framing of a cargo van to the shell where the original manufacture bonding broke away. I left the original foam looking bonding in place. It was still firmly attached to the framing. The Sikaflex bonded to both the original foam and the the steel van shell. It helped reduce some of the vibration and noise. I allowed 6-7 days cure time. BE CAREFUL TO GET AS LITTLE ON YOU HANDS AS POSSIBLE. Clean it off your skin as soon a possible. Even after half an hour or so it is hard to remove and remain on your hands for a week or so.

    This a high quality strong elastic sealer adhesive. Once dry and cured its strong. Relatively low odor. Highly recommend.
    2 people found this helpful
    Helpful
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    Nubster
    4.0 out of 5 stars The “white” delivered, and even labeled such, is grey!
    Reviewed in the United States on September 15, 2024
    Color: WhiteStyle: CompactVerified Purchase
    The “white” color sold is not white. It is GREY.
    Helpful
     Report
    LouB
    5.0 out of 5 stars Adheres Metal to Glass Quite Well
    Reviewed in the United States on October 8, 2024
    Color: BlackStyle: CompactVerified Purchase
    Challenge finding an adhesive to reattach metal decorative window moulding to glass. Tacky when applied such that no tape required to affix metal to glass. So far so good! Easy alcohol cleanup until it dries.
    Helpful
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    Kristie Marshak
    5.0 out of 5 stars Tends to buble
    Reviewed in the United States on October 11, 2024
    Color: BlackStyle: CompactVerified Purchase
    I have used alot of sikka on my building. This was used in a concrete saw cut. Bubbled not a great finish. The others products seem to do this if it's thick. Maybe it's a temp thing . It's my house and we are doing more steps with the concrete but it didn't work. Seemed to offgass and bubble in a small saw cut in concrete.
    Helpful
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    Steve W.
    1.0 out of 5 stars Not so much the product But 2nd time WRONG COLOR sent
    Reviewed in the United States on July 25, 2024
    Color: WhiteStyle: CompactVerified Purchase
    The product is great. But beware of what they ship. The first time I ordered it. It came correctly. WHITE. The second time I ordered it. It came incorrectly. BLACK.
    Now ordered a tube in May for our RV and wasn't able to do the project till today. And find when opening it.
    It is GREY!!! On top of that I tried to replace it. Because I like the product and because I ordered it in May it is useless to me and non-returnable. 20.00 down the drain.
    Won't be taking any more chances with ordering this online.
    VERY DISAPPOINTED
    Customer image
    Steve W.
    1.0 out of 5 stars Not so much the product But 2nd time WRONG COLOR sent
    Reviewed in the United States on July 25, 2024
    The product is great. But beware of what they ship. The first time I ordered it. It came correctly. WHITE. The second time I ordered it. It came incorrectly. BLACK.
    Now ordered a tube in May for our RV and wasn't able to do the project till today. And find when opening it.
    It is GREY!!! On top of that I tried to replace it. Because I like the product and because I ordered it in May it is useless to me and non-returnable. 20.00 down the drain.
    Won't be taking any more chances with ordering this online.
    VERY DISAPPOINTED
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    One person found this helpful
    Helpful
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    Top reviews from other countries

    Translate all reviews to English
    Nelson
    5.0 out of 5 stars OEM product
    Reviewed in Canada on November 25, 2024
    Color: WhiteStyle: CompactVerified Purchase
    Works as intended.
    Report
    Victor Gomez
    5.0 out of 5 stars Calidad inigualable
    Reviewed in Mexico on May 8, 2022
    Color: BlackStyle: CompactVerified Purchase
    Sorprendente adhesión
    Report
    Kym Healy
    5.0 out of 5 stars sikaflex is the BOMB
    Reviewed in Australia on November 27, 2023
    Color: BlackStyle: CompactVerified Purchase
    Great brand always works
    Report
    Erik
    5.0 out of 5 stars Easy to use
    Reviewed in Canada on December 4, 2024
    Color: BlackStyle: CompactVerified Purchase
    Easy to use and very strong
    Report
    Miryam
    5.0 out of 5 stars Calidad
    Reviewed in Mexico on September 4, 2024
    Color: BlackStyle: CompactVerified Purchase
    Pega muy bien, de pronto lo sentí muy líquido, porque yo me imaginaba era más espeso, pero si funciona perfecto.
    Report