Hi-Gear METALLIC - CERAMIC RADIATOR & BLOCK SEAL FLEET (for commercial vehicles). It is used to repair cracked cylinder heads and blocks, gaskets of block heads, radiators (for commercial vehicles). It reliably eliminates anti-freeze leaks through the block heads. It is especially efficient in case of leaks of additional gaskets. It repairs cracked aluminum or cast-iron engine heads and blocks with the weld strength. It eliminates strong leaks of copper, aluminum, plastic and composite radiators, furnaces of heaters forever. It sustains vibration, temperature fluctuations, high pressure, is non-washable and non-soluble. It comprises a unique combination of the thinnest ceramic fibers which provide the repaired area with additional strength and which can repair the damages of a larger profile. The sealant flows to the leak (crack) together with a coolant and forms a metal-and-ceramic plug which polymerizes and expands. As a result, the leak stops.