For pieces coming right up off the glass, use a bit of super glue to tack the lifted section back down to the glass. Once that is back in place and dry, triple thick the whole thing.
Supposedly there are 2 types of triple thick spray, and if I recall one mfg is preferred over the other. As to which one is best, I cannot answer that unfortunately. I do know McMean has had good success with triple thick, so you might want to drop him a line on it. (or search on here for one of his posts on this subject)
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