SIKA

SIKA Sikaflex-221 Multi-Purpose Polyurethane Sealant Adhesive 10 1 fl oz White Fast-Curing Permanent Elastic Bond Weather-Resistant Sandable Paintable

467+ bought in the past month

$13.30$17.10

About this item

  • VERSATILITY AND QUALITY IN ONE - Sometimes simply called Sika 221 white, 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
$13.30
Was $17.10Save $3.80

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Product details

ColorWhite
BrandSIKA
Item Weight10.1 Ounces
Liquid Volume10.1 Fluid Ounces
Item FormPaste

Technical specifications

colorWhite
brandSIKA
item_weight10.1 ounces
liquid_volume10.1 Fluid Ounces
item_formPaste
surface_recommendationRoof, Vent, Pipe
water_resistance_levelWaterproof
number_of_items1
manufacturerSIKA
upc338860050980
global_trade_identification_number00338860050980
unit_count10.1 Fluid Ounces
materialPolyurethane
model017-90891
product_dimensions11.5 x 2 x 11.5 inches
item_model_number017-90891
batteries1 Nonstandard Battery batteries required.
is_discontinued_by_manufacturerNo
manufacturer_part_number0911.1270
best_sellers_rank#1,261 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #4 in Polyurethane Adhesives #15 in Urethane Adhesives
date_first_availableFebruary 28, 2012

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Customer reviews

4.62,818 ratings

Customers say

Customers find the sealant works well, particularly on roofs and vertical walls, and appreciate its ease of application and quick setting time.

★★★★★

Perfect for automotive use

OliviaOctober 6, 2025✓ Verified purchase

I used Sikaflex to adhere a roof wing to the back windshield of my car, and I’m seriously impressed with how well it worked. The bond is incredibly strong and feels permanent once cured. I let it set for about 24 hours before driving, and even after months of highway speeds and temperature changes, the wing hasn’t budged at all. The application was pretty straightforward, it has a thick, tacky consistency that gives you enough working time to position everything correctly before it starts to set. I’d recommend taping or clamping the part in place while it cures, because it does take a while to fully harden. Once cured, it’s flexible enough to handle vibration and movement, which is great for automotive use. One thing to note: this stuff is messy. It’s sticky, and once it gets on your hands or paint, it’s not easy to remove. Wear gloves, mask off surrounding areas, and have some cleaner or mineral spirits ready. Overall, Sikaflex delivered exactly what I needed, a strong, weatherproof, and vibration resistant bond that’s holding my roof wing securely in place. It’s not the cheapest adhesive, but it’s worth it for the strength and reliability. Read more

★★★★★

Great stuff for RV

Ilya RogersFebruary 6, 2026✓ Verified purchase

Oh this is the stuff you want working on bare metal airstream! Works very well on vertical walls, you can probably use it on the roof too but this isnt self leveling. Used it to seal all the marker lights, windows, doors, etc. Read more

★★★★★

Great stuff

hgboydJanuary 1, 2026✓ Verified purchase

This stuff is fantastic, especially for bonding hard to glue plastics. Be sure to wear gloves - it is very durable on skin! Read more

★★★★★

Tight bond

MattJanuary 23, 2026✓ Verified purchase

This sealant worked perfect on my Toyota Tacoma to fill the bed-line gaps. It is crack resistant I bought extra in case I ran out during the project but was able to get my money worth during the project. Dried quickly and looks like a factory finish. Read more

★★★★☆

Messy but effective

ktolaySeptember 7, 2025✓ Verified purchase

This product is not water solvable and sticky as heck. Requires a bit of caulking skill but really bonds and is somewhat sandals too. Read more

★★★★★

Seal it up!

kurtskiJanuary 14, 2026✓ Verified purchase

I purchased this to seal mounting points for a Starlink antenna on top of our motorhome. This is a professional product and I expect it will prevent any water penetration. Read more

★★★★★

Holds like all get out

Danny D.January 6, 2026✓ Verified purchase

What can I say that hasn’t been said? Used this to install a fan on a campervan. It ain’t going nowhere and 100% confidence it will never leak. Read more

★★★★★

Works great

CustomerJanuary 25, 2026✓ Verified purchase

This stuff works great for car windows. Make sure it’s not too cold because I did get a pinhole in one of my windows after I was struggling to get a perfect bead because it was so hard to squeeze the tube. Next time I will soak the tube in warm water for 20 minutes before starting to use it.(actually i will sous vide it to get it to the perfect temp and make sure I’m not overheating it) Read more

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