Bar’s Leaks reformulates Liquid Copper

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Bar’s Leaks says it has reformulated its Liquid Copper Block Seal Intake and Radiator Stop Leak to permanently seal larger leaks in gaskets, radiators, heater cores, intake manifolds, blocks, heads and freeze plugs. According to the company, Liquid Copper uses an advanced antifreeze-compatible sodium silicate liquid glass formula so that no draining of the cooling system is required. Bar’s Leaks says it works with all types and brands of antifreeze, including conventional green or blue (silicate-based) and extended life red/orange or yellow (OAT/HOAT) coolant.

Liquid Copper is formulated to stop leaks by forming a physical seal using organic and synthetic fibers, copper and an ionic-modified mineral; the seal forms as the coolant and product flow through the leak, and a wetting agent cleans the sides of the hole or crack to prepare the surface for bonding. The company says the first fibers catch on the side of the leak, building on each other to bridge the entire hole; the fibers then act as a sieve to trap more fibers, copper particles and minerals to create a composite seal. The seal is cemented with liquid glass, according to the company; as the temperature increases, the liquid glass hardens to make the seal permanent.

Bar’s Leaks says Liquid Copper will not harm the cooling system when installed properly, nor will it clog the cooling system or heater core; it can be used in any water-cooled vehicle, and one 18-ounce bottle treats cooling systems up to six gallons. For more information, go to