From what I've heard of Rust-O-Leum it might be a good cheap paint job now but if they decide to use good paint in the future, the whole car may need to be taken down to the metal. Rust-O-Leum has fish oil in it and fish oil bleeds thru other paints and products. So it has to be completely removed prior to repainting with any thing other then more Rust-O-Leum or similar paint.

I guess I could have been told wrong, so I will refer this issue to the skilled painters.