Radiator Stop Leak & Sealant (Radiator Hole Sealer)

Professional-grade Radiator Stop Leak designed to permanently seal hairline cracks and leaks in the cooling system, including radiators, heater cores, and cylinder head gaskets. This advanced formula circulates within the coolant and reacts upon contact with air at the leak point to form a durable, pressure-resistant seal. It is specifically engineered not to clog radiator channels or interfere with the operation of the water pump and thermostat. Compatible with all types of antifreeze/coolants and safe for use with aluminum, steel, and plastic components. A reliable solution to prevent engine overheating and costly repairs.