Permanently seals leaks
- 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.
For best results, especially for older vehicles, clean the system with STP® Radiator Flush, to remove rust, lime scale and deposits before adding STP® Radiator Sealer.