Scuff it, wipe it down, prime it and paint it. If it looks like it will have adhesion or bleed through issues go with an oil primer like Zinsser's Cover Stain, if not prime with a wb product like Zinsser 123. You could do a test spot with the 123 let it cure and give it the scratch test, more than likely it will not be a problem but I can't see the surface. Also tint your primer to your desired color.
Take before and after pics and post em here.