To paint over ANY surface, without sanding, use a product called 'ESP Easy Surface Prep', available at hardware and paint shops. Wipe on, wipe off and paint in 90 minutes. Works well over enamel paint , without having to sand. SAVES HOURS of work. It was recommended to me by a professional painter.
Love it! Spray painted bottle caps, paint a tray white, arrange dry caps on dried tray, next used "acrylic water" to pour over the caps. 2 part epoxy is sold at HL & Michael's, but it is cheapest at Walmart, in Floral Dept. Follow the directions, mix the compounds and pour it on. It's self-leveling, which is great! The tough part is waiting 48 hours, because it cannot be disturbed at all! The acrylic hardens without incident & is ready for use!
I have a couple pans with my name on the bottom and they've been great for potlucks! Here's a tutorial on how to make them. Great idea for wedding or Christmas gifts!
How to make a pom pom bow from tulle