My car's trunk lid has a nasty rust spot. My Dad recently asked me why I don't just sand it down, bondo and paint it and that probably isn't a bad idea. The thing is that from the outside it looks manageable but on the inside of the trunk lid the sheet metal is folded over and it looks like there's already a decent amount of rust both on the inside of the crease and in the hard to reach area below it.
Is it too far gone? Will the rust just creep through a few months later?
I have some experience spray painting but I never removed rust before.
2002 VW Polo 9N