i did a set a while back. tape off the polished outer ring, use paint stripper to remove most of the old paint. i used glass beads to finish and remove the last of the paint, this step also leaves a nice even texture, don't glass the outer ring, it will cause damage, to finish the outer ring, i chucked them up in a brake lathe and used different textures of scotch pad until the scratches were gone, then retaped them and painted the centers, the more time and effort you put into this, the nicer they'll turn out, mine came out really good, looked like new