High-tech product for repairing various metal elements of the cooling system: damaged cylinder heads and cylinder blocks; radiators; copper, aluminum and composite radiators; passenger compartment radiators. The product contains a unique combination of the best ceramic fibers, which give the repaired element additional strength properties. It is able to eliminate damage with a large cross-section. Permanently eliminates leaks from radiators and heaters. Does not interfere with the circulation of the coolant. Polymerizes only when flowing out of the leak. The substance enters the leak (crack) with the coolant and forms a metal-ceramic plug at the leak site, which polymerizes upon contact with air. The leak stops. Thanks to the thermal expansion coefficient close to that of metals and the elasticity of ceramic fibers, the product ensures reliable repairs. Safe for all types of cooling systems. Compatible with all coolants. Can be used with water.