I'm prepping my Prewar Elgin for paint. Just finishing up bead-blasting and sanding. Though there is still some light surface oxidization and such...no rust. More like "color" or "orange hue" than oxidization really. Is this okay to prime over and do a professional paint job? Or does the metal need to be perfect? I am not concerned with ripples or waves as I'll be doing multiple coats and wet-sanding. I am more concerned about any of the new paint being ruined later in life from underlying oxidization.