Dispersion for sealing leaks in water cooling systems in motor vehicles. This product reliably seals hairline cracks and small leaks. The solids dispersion is stabilized in a carrier fluid. It is used for sealing small leaks in cooling circuits of cars, commercial vehicles, buses, and two-wheeled vehicles. Also suited for cooling water circuits equipped with water filters. The content treats 10 liters of coolant. It permanently and reliably seals hairline cracks and small leaks, is suitable for aluminum radiators, and is compatible with conventional coolants and antifreezes. It has no negative side effects on the water pump or heating circuit. Application: Shake before use. Add contents to the cold cooling system. Start up the heater. Then drive the vehicle for at least 10 minutes.