Full Instructions for all 3 Irontite Additive Products

Thoro-Flush  (Green Cap)

You can use Thoro-Flush with your existing Anti-Freeze mixture that is in the cooling system or you can drain that out and use Thoro-Flush with plain water. It can be used in all kinds of metal systems. Cast iron or Aluminium.  

  1. Drain 1 gallon of fluid from a full coolant system.
  2. Pre-mix the appropriate amount of THORO-FLUSH powder based on your cooling system capacity with 1 gallon of water. One bottle equals 6 gallons.  (Example, you have a 3-gallon capacity cooling system then you would use only 1/2 of the Thoro-Flush bottle.)  
  3. Pour the mixture into the radiator. 
  4. Run the engine for about 10 minutes after it reaches operating temperature. Do not allow the system to overheat.
  5. After the engine cools enough, drain out the Thoro-Flush mixture and refill with clean water.  Run the engine up to operating temp again. Allow to cool enough to drain water.  Repeat this rinse process until the water drains out clean.
  6. You are now ready to proceed with either  CERAMIC MOTOR SEAL and/or  ALL WEATHER SEAL from Irontite.  See those items for directions.

Ceramic Motor Seal  (Red Cap)

Warning: Ceramic Seal is not compatible with antifreeze. All antifreeze MUST be removed before use.

Raw Ceramic Seal will damage painted and chrome surfaces permanently.

CAUTION : ALWAYS ALLOW ENGINE TO COOL so the radiator cap or top radiator hose can be removed safely.

  1. Drain and flush the coolant system. (We recommend Industrial-Strength  Irontite Thoro Flush .) Rinse the system with water at least once.
  2. Shake bottle well. If the bottle has sediment in the bottom be sure to get it mixed up before adding to your system.  (no hard lumps) If there is more than 3/4" of sediment that will not mix, do not use it.
  3. If the vehicle does not have a pressurized radiator cap, remove the top radiator hose and fill water and product directly into the radiator from the top hose.
  4. Fill coolant system with clean water and the appropriate amount of Ceramic Seal based on your cooling system capacity.  (1 bottle = 6-gallon system capacity. 3-gallon system capacity = 1/2 bottle)
  5. Ceramic Seal  WILL PERMINANTLY  stain paint and/or chrome surfaces. Wipe any excess from cap and radiator neck.
  6. Replace the radiator cap or re-attach the radiator hose and tighten the hose clamp.
  7. Completely fill system with water, including overflow tank. Run the engine and check the level again.
  8. Run the engine on fast idle for a minimum of 1 hour or the vehicle may be driven up to two days. Then drain completely and rinse/flush with water. The longer you run the thicker the seal coat will be.
  9. Leave coolant system open and empty for 12 hours minimum to let Ceramic Seal air dry and cure. A basic handheld hairdryer can be used to speed up and/or improve the drying process.
  10. After 12 hours or more of air drying, fill with a normal coolant mixture.
  11. We recommend adding Irontite All Weather Seal, along with the coolant mixture to prevent further leaks.



Caution: Avoid Skin or Eye contact.
First Aid: Eyes & Skin - Flush for 15 minutes with cool water. Internal ? Take 3-4 glasses of water or milk. Do NOT induce vomiting. Call a physician at once.

All Weather Seal   (Blue Cap)

DO NOT add to engine oil, transmission or brake fluid. 

Activation happens when both heat and air, under mild pressure, is encountered by the solution.

One bottle treats up to 6 gallons. HD trucks may require additional bottles. Use the appropriate amount for your cooling systems' capacity.

CAUTION: ALLOW ENGINE TO COOL so the radiator fill cap can be removed safely anytime you are removing the cap. 

  1. We recommend if the coolant is old, dirty or rusty that you flush with  Irontite Thoro-Flush and refill with new coolant mixture. Adding additives to a dirty coolant system may harm the system. Flushing is not necessary for the product to stop a leak but can help to avoid possible complications. 
  3. (A) If the radiator has a cap, put All Weather Seal directly into the radiator. (B) If you have a later model vehicle with no radiator cap, put the Irontite All Weather Seal into the radiator fill reservoir.  The product must mix with your existing coolant solution to function correctly. You can pre-mix in a bucket before pouring in to help with the mixing process.
  4. Wipe any excess from the cap or reservoir neck. 
  5. Fill coolant system with coolant. 
  6. Replace the cap.
  7. Start vehicle with the heater on high, full heat, and run the engine to full operating temperature. Leaks usually stop in 2–5 minutes after reaching operating temperature. First, run we recommend driving for 30 min or more to ensure the product is fully mixed with your coolant mixture.
  8. Drive the vehicle as normal. All Weather Seal will continue to prevent further leaks and lubricate the water pump.

Note: Be sure to keep your coolant mixture level is full while using All Weather Seal. Be sure, if your vehicle has a thermostat (most do), that it is working properly so that coolant can both get up to operating temperature AND can flow through the entire cooling system.  If your thermostat does not open, the All Weather Seal won't get correctly mixed into your system and may cause damage to your cooling system.

HOW ALL WEATHER SEAL WORKS (using metaphors to help illustrate)

All Weather Seal dissolves to form a microemulsion much like instant coffee dissolves into the water. If it weren't for the coloring we add to it you would not be able to tell it was in your system once it's fully dissolved. However, unlike instant coffee, All Weather Seal is not as anxious to dissolve so it must be agitated.  It doesn't take a lot of agitation so adding it where circulation occurs is typically good enough.  Or you can kind of pre-mix it in a bucket before adding it to your system. 

Once mixed it remains dormant until two conditions are encountered.  The first is that the solution must be at or near operating temperature and the second is that it must encounter air.  When those two conditions are encountered by the solution it begins to form a patch over the leak going to air much like a Beaver building a damn. 

Helpful Information about various Kwik-Way, Van Norman, and Irontite Products

Visit one of our Main Websites for more.

irontite.com  van-norman.com  and  kwik-way.com