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🛡️ Seal it once, drive forever – the ultimate fix for fearless road warriors!
K&W 401016 Block Seal Permanent Metallic™ is a professional-grade, 16 oz sealant that forms a molecular bond as strong as steel. It effectively seals cracks and leaks in engine blocks, head gaskets, freeze plugs, and radiators made from cast iron, aluminum, copper, and bi-materials. Designed for all water-cooled diesel and gasoline vehicles, it withstands extreme pressure and temperature without washing away, exceeding ASTM D6107 standards for reliable, long-lasting cooling system protection.

| ASIN | B000CIPV5E |
| Best Sellers Rank | #143,700 in Automotive ( See Top 100 in Automotive ) #10 in Radiator Sealers #3,282 in Oils & Fluids |
| Brand | CRC |
| Customer Reviews | 4.0 4.0 out of 5 stars (414) |
| Date First Available | July 7, 2004 |
| Exterior | Machined |
| Item Weight | 1.15 pounds |
| Item model number | 401016 |
| Manufacturer | CRC |
| Manufacturer Part Number | 401016 |
| Model | 401016 |
| Product Dimensions | 5.87 x 2.31 x 2.13 inches |
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