Containing natural plant fiber, high curing agent, anti-foam and rust corrosion inhibitor, can be quickly stopped in the water tank cooling system, heater radiator, cylinder, pump, seal, cylinder liner and other parts of the leakage, and does not block the radiator channels, without prejudice to the cooling system parts, rust corrosion, which can greatly extend the tank life, save maintenance time and costs for adding various types of antifreeze and coolant.