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RISLONE Radiator Stop Leak Concentrate

RISLONE Radiator Stop Leak Concentrate

Regular price $17.11 AUD
Regular price Sale price $17.11 AUD
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Rislone Radiator Stop Leak is specially designed to stop minor cooling system leaks and drips caused by normal cooling system wear and age. For most vehicles leaks stop in only a few minutes. Seals leaks in plastic, aluminium and metal: Radiators, heater cores, gaskets & welch plugs. Works with ALL types and colours of antifreeze coolant and/or water.

  • Stops & Seals Coolant Leaks
  • Works with Any Colour Antifreeze
  • Stops Leaks & Drips from Wear & Age 

Dosage & Directions

Use 1 bottle for 6 & 8 cylinder engines and ½ a bottle for 4 cylinder engines.

Install 1 bottle for every 15L of coolant in heavy duty applications.

Cooling systems that are dirty or partially clogged should be flushed before usage. Protect from freezing. If frozen, let the product thaw out, shake well, and use as normal.


  1. Shake well and pour into radiator after engine cools
  2. Fill radiator and overflow tank to proper level and reinstall cap
  3. Drive or idle engine for 15 to 30 minutes
  4. Leave in cooling system for continued protection
  5. For preventative maintenance, use once a year to help guard against future leaks

Opening cooling system while engine is hot or running may cause severe burns.

Observe local laws and regulations. Where permitted, dispose of in sanitary sewer systems. Never pour onto the ground or storm sewer system.


Do not mix or install with any other product. If another product has been installed,  flush the system thoroughly.

Frequently Asked Questions

Can Rislone Radiator Stop Leak be installed in existing antifreeze?
This product is specifically designed to be directly added to the cooling system with out having to flush out the antifreeze.

Will Rislone Radiator Stop Leak work in the new extended life antifreeze?
Yes, Rislone is compatible with both conventional green or blue (silicate-based) and extended life red/orange or yellow (OAT/HOAT) antifreeze.

How long does it take for the Rislone Radiator Stop Leak to work?
We recommend you drive/idle vehicle for 15 to 30 minutes. In most cases the leak will be sealed within this amount of time. If the leak is not sealed, a second application maybe required.

Will Rislone Radiator Stop Leak plug my heater core?
No, the sealing particles will pass through the tiniest passages inside of the cooling system. If using to stop heater core leaks, make sure you turn your heater control to HOT. Some vehicles have a valve that controls coolant flow through the core.

I accidently added the Rislone Radiator Stop Leak into my petrol tank, what should I do?
Rislone Radiator Stop Leak is only designed to be added to the cooling system. If the product is installed in the petrol tank, the tank should be removed and cleaned out by a professional mechanic.

I accidently added the Rislone Radiator Stop Leak into my engine oil, what should I do?
It is only designed to be added to the cooling system. If the product is installed in the engine oil and the engine has not been started, in many cases you can remove the valve cover and drain the oil leaving the drain plug off. Then use an engine flush washing out the head keeping special attention to the oil return holes that run down to the oil pan. Clean these out and pour the engine flush down these holes flushing everything into the oil pan and out the drain hole. If the engine has been run, you need to take the vehicle to have a professional mechanic evaluate what can be done to clean the inside of the engine. This might include taking the engine apart to clean all of the parts.  

Technical Information

CODE: 41196
SIZE: 325ML 
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