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🔧 Seal it once, seal it right — the ultimate black bond for pros who settle for nothing less.
Sikaflex-221 is a premium one-component polyurethane sealant and adhesive in a convenient 10.1 fl oz cartridge. It delivers permanent, elastic seals that bond strongly to metals, plastics, ceramics, and primers. Engineered for durability, it resists aging, seawater, acids, and caustic solutions. NSF-approved for use in drinking water and food production, it’s waterproof, sandable, and paintable—perfect for professional-grade internal sealing and bonding applications.















| ASIN | B00NW5LWHA |
| Best Sellers Rank | #80,806 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #51 in Adhesive Caulk |
| Brand | SIKA |
| Brand Name | SIKA |
| Colour | Black |
| Country of Publication | USA |
| Customer Reviews | 4.5 out of 5 stars 1,551 Reviews |
| Item Form | Paste |
| Item Weight | 10.1 Ounces |
| Liquid Volume | 10.1 Fluid Ounces |
| Manufacturer | A P Products |
| Manufacturer Part Number | 90893 |
| Material Type | Silicone |
| Model | SIKA-90893 |
| Number of Items | 1 |
| Number of Packs | 1 |
| Size of liquid in ounces | 10.1 Fluid Ounces |
| Surface Recommendation | Versatile, suitable for various surfaces |
| Unit Count | 300 Milliliters |
| Water Resistance Level | Waterproof |
J**O
Excelente
Excelente producto sella muy bien ya no se metió el agua
L**C
Joint
Parfait pour refaire les joints de vr. Je recommande
O**A
Perfect for automotive use
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
sikaflex is the BOMB
Great brand always works
D**B
The best
Best adhesive sealant I've ever used. I've gone through many tubes of this. It's never let me down except when removing it lol!
Trustpilot
2 weeks ago
5 days ago