Your vehicle's cooling system plays a vital role in its overall functioning. Leaking gaskets and seals reduce the capacity and functionality of the cooling system, causing the engine to run hotter and increasing the risk of further damage. Additionally, cavitation, or the formation of cavities in the coolant as it passes through the water pump, causes intense micro-explosions that will eventually damage the water pump impellers, affecting coolant flow. Bar's Radiator Leak Stopper is specially designed to seal small leaks and drips in the cooling system and reduce or eliminate cavitation. Bar's Radiator Leak Stopper works on leaking plastic, aluminum and metal radiators, heater cores, blocks, head gaskets, gaskets and freeze plugs. Additionally, Rhizex particles will break up low pressure cavities caused by cavitation and reduce or eliminate these internal micro explosions. Directions: Shake well and pour the entire contents into the radiator (not the overflow tank) after the engine cools. Replace the radiator cap and drive or run the engine for at least 15 minutes. If leaks persist, use a second application. Use one bottle for 4 cylinder engines and two bottles for 6 and 8 cylinder engines. For best results, use Bar's Nural or Bar's 10 Minute Flush to clean the cooling system of dirty radiators. NOTE: Mechanical attention may be necessary if leaks continue after treatment. Benefits: Seals leaks throughout the cooling system. Helps keep the cooling system clean. Reduces or eliminates cavitation damage. Warnings: Always use caution when working near the engine or radiator. Be careful when removing the radiator cap. DANGER: Opening the cooling system while the engine is hot or running can cause serious burns.