Radiator Stop Leak

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Cooling System

Wynn’s Radiator Stop Leak is a unique blend of non-ferrous fibres and surface active agents which combine to plug hairline cracks and pinholes associated with cavitation pitting and corrosion. It will not cause any blockage of the radiator core or cooling matrix, nor will it harm any cooling system components. Radiator Stop Leak is compatible with all Ethylene Glycol and OAT coolants as well as Aluminium and rubber hose safe.

It is recommended that Wynn’s Radiator Stop Leak is carried in recovery vehicles as an essential emergency repair item.

Case size: 1 x 375ml
Case size: 12 x 375ml

For case pricing, please use  Request a Quote 

Product Video

Key Benefits

  • Effect emergency repairs to prevent loss of coolant
  • Enables extended trips to be completed without costly repairs or time wasted
  • Will stop head gasket seepage preventing oil/water mixing
  • Simply removed by draining when maintenance needs to be carried out.
  • Plugs holes up to 0.7mm


  • Corrosion or pinhole leak in radiator
  • Head gasket seepage
  • Radiator pressure loss

Directions for use

  1. Shake bottle well
  2. Idle engine with heater on, add entire contents to radiator
  3. Ensure radiator cap is firmly replaced
Product Code 512
Case size 1 x 375ml
12 x 375ml
Physical state Liquid
Density @20°C 1.001 g/cm³
Colour White
Flash point N/A
Odour Characteristic
Barcode 6001296005127
MSDS Download PDF
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