This Radiator Stop Leak is designed for sealing small leaks in cooling systems, often caused by stone chipping, porous soldered connections, or hairline cracks. It effectively prevents coolant loss and overheating. The dispersion completely seals these leaks immediately and safeguards the combustion chamber against damage from coolant ingress. It is suitable for radiator coolant and heating systems, with or without water filters, and is safe for aluminum and plastic radiators. One 250 ml bottle is sufficient for up to 40 liters of coolant and is compatible with all conventional coolant additives and antifreezes. It can also be used preventatively. It permanently and reliably seals hairline cracks and small leaks. It has no negative side effects on the water pump or heating circuit. Application: Shake before use. Add contents to the cold cooling system and start up the heater. Then drive the vehicle for at least 10 minutes.