STP® Radiator Sealer is designed to repair radiator leaks quickly and effectively, forming a permanent seal. It contains corrosion inhibitors to help prevent the formation of rust and deposits. STP® Radiator Sealer also lubricates the water pump.

STP® Radiator Sealer should be used as follows;

• Run the engine until the coolant is warm (not hot).
• Shake bottle well & pour entire bottle of STP® Radiator Sealer into radiator.
• Run the engine for approximately 10 minutes or drive a short distance, allowing seal to harden. Be careful when opening the radiator/cooling system: hot coolant or steam might escape. One bottle treats cooling systems up to 14 litres capacity.

STP® Radiator Sealer is suitable for all types of radiator, all types of antifreeze and safe for rubber hoses, metal parts and gaskets.