Is Thermagasket compatible with Anti Freeze/Coolant (Ethylene/ Propylene Glycol)?
Thermagasket is not chemically compatible with Antifreeze. Therefore we recommended that you completely flush the cooling system and replace the antifreeze with water before treating the vehicle. Antifreeze is a complex alcohol, therefore it has a solvent action on the surface of metal which will inhibit optimal adhesion. Once the Thermagasket treatment is completed and your vehicle is repaired you will flush the cooling system of Thermagasket and replace it with a 30% Anti Freeze/70% fresh water mixture. If you are in an area where the temperatures are colder than 0 degrees F use a 50%/50% mixture.
