Forms a permanent molecular bond that's as strong as steel. Seals cracks & holes in cast iron & aluminum engine blocks, head gaskets, freeze plugs, & copper, aluminum & bi-material radiators & heater cores. Tested by an Independent test lab.
CRC K&W 401016 Block Seal Permanent Metallic™ Block & Radiator Seal - 16 Oz : Automotive
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Permanent molecular seal that's as strong as steel Seals cracks & holes in cast iron and aluminum engine blocks, head gaskets, freeze plugs, and
CRC K&W 401016 Block Seal Permanent Metallic™ Block & Radiator Seal - 16 Oz
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CRC Industries, Inc., 401016, Permanent Metallic® Block Seal