This product is formulated to effectively seal leaks in radiator and heater cores, weeping cylinder head gaskets and to temporarily repair corroded welsh plugs.

It is formulated with a base of fibre and fine metallic particles. It will not soften or harm seals and hoses. It has no effect on metals, including aluminum, and is safe to use in all radiators. It is compatible with all corrosion inhibitor and all other anti-freeze/anti-boil products.

Note: If the cooling system is dirty or restricted, first clean with Radiator Cleaner.