Seals micro-cracks and small leaks quickly and easily in all closed liquid cooling systems. Use in radiators. heat exchangers. leaking water pumps. loose connections and cracked hoses. Does not create the risk of additional blockage. Suitable for use in most vehicle cooling systems. industrial systems and also for preventive use. Works with all types of coolants (inorganic. hybrid. OAT). Usage: 300 ml is sufficient for a 12 l cooling system.