Can I paint over a piece that has been previously chalk painted and/or waxed?

You can! If your previous finish is loose, peeling or chipping, you're going to want to sand away the loose and get a smooth surface. If your previous finish is full of texture, our paint will self-level into that texture. You can sand it smooth for best results. You do not need to strip or sand to bare wood. Once you have the issues address, you're good to Just Clean & Paint! Please note: It is important to throughly remove any previously applied wax finish. A couple scrubbings of our deglosser shoudl do the trick.