Radiator Stop-Leak is an additive for sealing leaks in water-cooled systems in motor vehicles. The product reliably seals hair cracks and small leaks. The solids dispersion is stabilized in carrier fluid. Properties: 1.Compatible with conventional coolant water refiners and antifreezes 2.Suitable for aluminum radiators 3.Permanently and reliably seals hairline cracks and small leaks 4.No negative side effects on the water pump or heating circuit 5.Can also be used as a preventative measure. The contents is sufficient for 10 liters of coolant