Our automotive radiator leak-proof powder contains wood powder, sawdust, and metal corrosion inhibitors. It can quickly locate and seal leaks and is suitable for radiators, heater cores, and antifreeze plugs. It is easy to use: 1. Make sure the engine is cooled and remove the radiator cap. 2. Make sure the water level in the tank is moderate, then measure the appropriate amount of leak-proof powder and slowly pour it into the radiator. 3. Fill the radiator and overflow tank to the appropriate height, reinstall the cap, and run the motor at a sufficient speed to circulate the water. Continue to run the motor for 15 minutes until the water heats up and stops. 4. If there is still leakage, re-add the appropriate amount of leak-proof powder. If the water has been used before the powder has worked, collect the solution and pour it back into the radiator and repeat the operation. It can quickly form an ultra-thin seal and leak layer, resistant to high temperature, high pressure, and strong shock, and ensure a lasting seal for leaks.