Good thread. I've had positive experiences with some of these; Rage, Upol glaze, and the Sprayway glass cleaner. Aside from the cars the Sprayway is an excellent cleaner for the granite in the kitchen, cuts the post cooking film around the cook top in a heartbeat.

Matthyj makes a good point about learning from someone with lots of positive experience. I learned about using phosphoric acid (in it's various forms/brands), as an example, years ago to kill rust from a guy who knew what he was doing. I read often online in various discussions about people who say you can't paint over steel that's been treated with phosphoric acid because it will "blow up". I take that to mean the top coat fails in some way. They may be correct..................in their situation. My guess would be they didn't do the full process or didn't do it correctly and left some residue behind. Cleanliness, make that absolute cleanliness, is the "secret" to good refinish outcomes.