What people don't seem to realize is paint (Triple Thick) & glass will expand & contract at different rates when heating and cooling. So over time triple think can do more damage than good. I have never used triple thick on a decent backglass and never will. I also will not buy a machine for the collection with triple thick on it. Original ink & paint on glass is bad enough and has enough issues so adding more makes no sense at all.

In my eyes the best way to repair a backglass is a full sheet of Mylar on it. Doing that is basically like making a backglass into a translite. Even if paint lifts from the glass it can't go anywhere. You might see a slight bubble from the front - like you see on translites from time to time - but at least your backglass will not flake off over time.