Hi Allen. Over my work bench is an acronym listed vertically. EBAN. E at the top.  It means, Nitrate over nothing, Butyrate over Acetate and Nitrate and Enamel over all. Not sure if Acetate based  paints are even available anymore, but the Nitrate at the bottom stays there. Not sure about Acrylic  paints. Of course there is always the caveat, try it on a test piece first. Great use for large pieces of scrap balsa sheet.