1 1

Nulon logo
Nulon· R50

Nulon Radiator Stop Leak 300ml

Nulon Radiator Stop Leak 300ml

$20.59 AUD
$20.59 AUD
Sale Sold out
Freight Courier or Pickup
Trade Trusted Since 2005
Need Help? (08) 8725 9299

Save this to a list

Create a free account to save parts lists across devices — and never lose track of what you need.

View full details
Overview

Nulon Radiator Stop Leak is a fibre-based formula designed to seal leaks in radiator and heater cores, weeping cylinder head gaskets, and corroded welsh plugs.

Compatible with all coolant types including anti-freeze and anti-boil products. Safe for seals, hoses, and all metals including aluminium.

Specifications
Volume: 300ml
Formula: Fibre-based
Compatibility: All coolant types, all metals including aluminium
Application Rate: 1 bottle per 10 litres of coolant
Features
  • Fibre-based formula — seals pinhole leaks in radiator cores, heater cores, and welsh plugs.
  • Safe for aluminium — no risk of damage to modern aluminium cooling systems.
  • Compatible with all coolants — suits all anti-freeze and anti-boil formulations.
  • Addresses weeping head gaskets — temporarily reduces coolant loss from minor gasket seepage.
Fitment / Notes
  • Note: Caution — exercise care when removing radiator cap if engine is hot.
  • Note: This product is a temporary repair only. Have the cooling system inspected and repaired at the earliest opportunity.
  • Fill coolant above top radiator hose level before adding product.
  • Start engine and turn heater on. Run to normal operating temperature.
  • Shake bottle well and add slowly to radiator.
  • Top up coolant and refit radiator cap securely.
  • Run engine for 15 minutes to allow product to circulate.
  • Inspect for leaks.
  • Note: If cooling system is dirty or restricted, clean first with Nulon R40 Radiator Flush and Clean.