My second graders are painting their coil pots this week. I use acrylic paint. Though I'd love to have all my students glaze all of their clay projects...I just don't have the time or money to do so. I use to feel guilty, but several years ago I went to a clay workshop with a professional clay artist(made his grandma into a pot!!..well..her ashes at least..anyways?!?!) & he said he often uses acrylic with his students(kids) do to time/money. That made me feel better! ha ha The kids love it..instant gratification. I'm loving the results. I have them use one metallic acrylic & one regular(they pick).