i'd take off what you can with the wheel, scuff up the rest of it with some 120 grit. primmer and paint. if you lightly wet sand with some 600 grit between coats, they'll come out pretty nice.
also, if you haven't used one of those with a cup brush before, go slow until you get a feel for it
also, if you haven't used one of those with a cup brush before, go slow until you get a feel for it