9 On to the body prep! Since we had so many new panels installed, most of our bodywork is a matter of taking care of a few shipping dings. But our roof panel had some major problems. There were dents, rust, old bodywork, and "oil canning" problems. To locate our problem areas, we began sanding the roof with 180-grit sandpaper on a sanding board. The dark spots you see here are the low areas that need to be repaired. Make sure you have quality shop lighting for all areas of your project.