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🛡️ Seal it once, seal it forever – the pro’s choice for unstoppable engine protection!
K&W 401016 Block Seal Permanent Metallic™ is a professional-grade, 16 oz sealant that forms a permanent molecular bond as strong as steel. It effectively seals cracks and holes in cast iron, aluminum engine blocks, head gaskets, freeze plugs, and various radiator metals. Designed for all water-cooled diesel and gasoline vehicles, it withstands extreme cooling system pressures and temperatures, surpassing ASTM D6107 standards. Independently tested and highly rated, it’s the trusted solution for lasting leak protection.

| ASIN | B000CIPV5E |
| Best Sellers Rank | #82,477 in Automotive ( See Top 100 in Automotive ) #7 in Radiator Sealers #2,316 in Oils & Fluids |
| Brand | CRC |
| Customer Reviews | 4.0 4.0 out of 5 stars (411) |
| 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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