Product Details


Radiator Stop Leak

BARCODE NUMBER: 9313555686508

For many people the first signs of a leaking radiator will be spotting on the driveway or an increase in engine temperature. Radiator leaks can cause irreversible damage to the engine requiring costly repairs if not fixed in time.

WYNN’S RADIATOR STOP LEAK is a premium water-based formula that prevents and seals external leaks in the cooling system and prevents head gasket seepage. This low viscosity product works fast but will not clog. Its buffered inhibitors help prevent corrosion. A sealing agent lubricates the water pump, which can improve efficiency, and prolong pump life.

WYNN’S RADIATOR STOP LEAK can be used as a preventative measure or to fix minor leaks & seepages in the radiator.

Features & Benefits:

  • Protects against coolant loss
  • Stops & prevents leaks
  • Seals leaks in radiator & heater cores and prevents head gasket seepage
  • Will not clog radiator waterways nor affect temperature sensors
  • Compatible with water & glycol, anti-freeze/anti-boil coolants
  • Compatible with cooling system components
Available Size 325 mL

Stops & Prevents Leaks


  • With heater control in HOT position
  • Shake bottle and add contents to the cooling system, CAUTION coolant may be hot
  • Top up the system with coolant if required
  • Run engine for approximately 5 minutes to circulate and stop leaks
  • Contents will treat a cooling system from 6 to 12 litres
  • Should only be used as a temporary repair for leaks
Radiator Stop Leak - Wynn's Australia