Moisture is definitely going to be a factor when deciding what paint to use. As a result, I would use an enamel or acrylic type of paint. Fusion Mineral Paint is an Acrylic Emulsion based paint rather than something like chalk or latex which I would never use in a bathroom. You Can Buy Fusion Mineral Paint Here. You can read more about the best paints for furniture here which shows my personal recommendations developed over years of refinishing and living with painted furniture.