Radiator Leak-Stop Radiator Leak-Stop was developed both as a preventive and as an acute problem solution to eliminate leaks in the engine's cooling system. Seals leaks in gaskets, clamps and small cracks in the radiator. Compatible with all anti-freezes and coolants. Easy to use – no disassembly needed Improves reliability of the cooling system Resistant to high temperatures, vibrations and pressure Neutral towards rubber hoses, gaskets and other system components Protects cooling system against corrosion and oxidation