CRC K&W 401016 Block Seal Permanent Metallic Block & Radiator Seal - 16 Oz
Brand: CRC
Color: Reddish Brown Lumpy Liquid


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