For a suspected head gasket leak I personally do not think this is the way to go. I have seen a glass coating remaining in passages of engines I have taken apart. The water glass was applied a long time before.

How much they put in was an open question as it used to be a favorite with used car dealers. You could order it and still might be able to from some drug stores. Just was a lot cheaper.

Until someone enlightens me otherwise. I will continue to believe that no matter what the labels and claims. It is still just water glass. Used originally to stop leaking boilers perhaps even before the advent of internal combustion engines .

By the same token I would use it if a car or engine was near enough to the end point. Otherwise I might suspect some issues with heat transfer through the glass coating. Although glass conducts heat pretty well.

They lie if they claim it does not also do this over time. Yes it will fuse at the hot spot though usually. Far more times than not. Then again I have no ideal of how much was put into those cooling systems on the engines I dealt with.

Head gaskets on old engines are kind of a right of passage. Cracks are another beast. Part of problem with cracks. I have always suspected is shutting down engines before letting any hot spots cool down.


Especially when you roll off the highway at high speed up to a fuel pump. Idling it for a couple of minutes first can do no harm. Otherwise if the coolant boils off the hot spots there are stress issues. Eventually they take their toll.