One thing to keep in mind is that once you use the WD-40 don't plan on painting it. A guy I know had a rat rod that he did the WD -40 thing to the body. Looked good for a rat rod finish 1/2 paint half rust for a few years. Then took it to a professional for paint removal [ blaster ] The main flat panels cleaned up but the WD-40 kept weeping out of the seams even after extreme solvent cleaning. On the clear paint look , I would think a flat or semi gloss would look better than gloss.