I recently picked up a Bally 2-in-1, with a very restorable playfield and backglass that's 95% good. The main girl's face has some spotty paint loss. The cabinet, however and in my opinion, will need repainted. The cabinet has had packing tape on it to secure plastic, and paint has flaked/pulled off. It's badly faded. There's a good bit of paint flaking to the point that it looks crappy.
I know some would frown on this, but I'm thinking that when I do a thorough cleaning on the playfield and touch ups as needed, I may clear it with 2pac. I've cleared a few other playfields, so not a total newb at it. I know it alters the look and can't be undone, like how Clay says it, but I feel that with a clear coat I can a) lock in and protect the touch ups and b) take care of the slightly concave inserts, making it play well.
The game I bought is actually the one in this video - from the guy who had it before the guy I got it from