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🔧 Seal it like a pro—permanent, paintable, and built to last!
Sikaflex-221 is a professional-grade, black polyurethane sealant and adhesive offering permanent elastic bonds across metals, plastics, ceramics, and more. It cures fully in 3 hours, is waterproof, age-resistant, and NSF-approved for safe use in drinking water and food environments. Its easy-to-use cartridge design ensures precise application, making it the go-to choice for durable, versatile sealing and bonding.















| ASIN | B00NW5LWHA |
| Best Sellers Rank | #1,004 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #3 in Polyurethane Adhesives |
| Brand Name | SIKA |
| Color | Black |
| Customer Reviews | 4.6 4.6 out of 5 stars (3,058) |
| Full Cure Time | 3 hours |
| Included Components | Sealant |
| Item Form | Paste |
| Item Type Name | Sealant |
| Item Weight | 10.1 ounces |
| Liquid Volume | 10.1 fluid ounces |
| Manufacturer | SIKA |
| Material Type | Polyurethane |
| Model | SIKA-90893 |
| Number of Items | 1 |
| Number of Packs | 1 |
| Part Number | 90893 |
| Surface Recommendation | Metal, Wood, Glass |
| Unit Count | 10.1 Fluid Ounces |
| Water Resistance Level | Waterproof |
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