Here is one of those things that burns my butt. The whole car was finish painted with rust bubbles and holes. This was done by a professional shop. This is why I don't trust the bodywork to continue the build when this kind of stuff lurks under the paint.

If you buy a car make sure you invest in one of the paint thickness gauges. It will alert you to exsessive body filler and repaints when considering a project. I did and knew I would find stuff like this on the rear wheelwell lip. Even knowing it still burns my butt.