CRC K&W 401016 Block Seal Permanent Metallic™ Block & Radiator Seal - 16 Oz
- Permanent molecular seal that’s as strong as steel.
- Seals cracks & holes in cast iron and aluminum engine blocks, head gaskets, freeze plugs, and copper, aluminum and bi-material radiators & heater cores.
- For use in all water-cooled diesel and gasoline vehicles.
- Withstands extreme pressure and temperatures of a cooling system and will not wash away.
- Professional grade formula exceeds ASTM D6107 for effectively sealing leaks in cooling systems.