Ceramic coolant sealants

[LivLandCruizer]

I think I have a small microscopic crack or breach of the coolant system overheated once and has never done it again, but I think perhaps there’s been a small bit of damage. Before I start ripping the head off I wondered if it would be worth a try, putting some high-quality ceramic seal in to see if it would buy me some time. Does anybody have any suggestions or product knowledge that would work in the KHJ Seven Prado

 

[EngineBlockEggs]

Do you mean a KZJ?

 

[LivLandCruizer]

Do you mean a KZJ?

yes sorry KZJ78 prado

 

[VPP]

If the overheating hasn't happened again, I doubt there is any damage. It might be a failing thermostat which tend to cause that condition. I would back flush the system and replace the thermostat and coolant.