Wynn's Cooling System Stop Leak is a product designed to stop small leaks in the radiator and cooling system, with anti-corrosive properties.
• Stops and prevents leakages in the radiator, cooling and heating system.
• Stops head gasket leaks.
• Will not harm rubber hoses, gaskets or other system components.
• Is compatible with all antifreezes and coolants, also with OAT coolants
(Organic Acid Technology).
• Is formulated to avoid clogging of radiator waterways and temperature
• Enhanced protection against rust and corrosion.
• For all “water” cooled systems of petrol, diesel and LPG engines when
minor leaks are noted.
• Can also be used as preventive agent.
• If the cooling system is excessively fouled, it is recommended to clean
first with Wynn’s Cooling System Flush.
• Check coolant level.
• Start engine, bring to operating temperature with all heater controls in
• Shake the can well and pour the total contents into the cooling system
via the radiator filler cap or via the expansion tank in case of a
completely closed radiator with through-flow system.
• Close the system and let the engine run for approx. 5 to 10 min. until the
leak or leaks are sealed.
• If necessary top up with cooling liquid.
• A 325 ml can treats systems with capacity 5 -12 litres.
Appearance: White suspension
Density at 15°C: 1,001 kg/dm³
pH value undiluted: 7,8
Freezing Point: Ca. 0°C