







🖤 Seal it once, seal it forever—Sikaflex-221, the black magic of bonding.
Sikaflex-221 is a premium one-component polyurethane sealant and adhesive designed for professional-grade bonding and sealing. It offers exceptional adhesion to metals, plastics, ceramics, and primers, with a durable, age-resistant formula that withstands seawater, acids, and environmental stress. Ready-to-use in a convenient cartridge, it cures quickly to a flexible, permanent seal that’s NSF-approved for use in drinking water and food production environments, making it the go-to solution for reliable, long-lasting seals in demanding applications.










| ASIN | B00NW5LWHA |
| Are batteries included? | No |
| Batteries | 1 Nonstandard Battery batteries required. |
| Best Sellers Rank | #43,199 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #33 in Adhesive Caulk |
| Brand | SIKA |
| Colour | Black |
| Country of Origin | USA |
| Customer Reviews | 4.5 4.5 out of 5 stars (1,388) |
| Date First Available | 16 January 2015 |
| Item Dimensions LxWxH | 30.5 x 5.1 x 30.5 Centimeters |
| Item Form | Paste |
| Item Height | 12 Inches |
| Item Weight | 286 g |
| Item Width | 2 Inches |
| Item model number | 017-90893 |
| Liquid Volume | 10.1 Fluid Ounces |
| Manufacturer | A P Products |
| Material | Silicone |
| Model number | 017-90893 |
| Net Quantity | 300 Milliliters |
| Number of Items | 1 |
| Product Dimensions | 30.48 x 5.08 x 30.48 cm; 286.33 g |
| Surface Recommendation | Versatile, suitable for various surfaces |
| Water Resistance Level | Waterproof |
O**A
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.
K**Y
Great brand always works
C**N
Me ayudó con la filtración de agua en estas lluvias
I**S
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.
P**D
Ideal para tapar orificios con tono obscuros
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