I've had this cheap plastic birdbath for years now and a few days ago decided to give it some life. In the heat of the moment I bought stone textured spray paint and made it look much better. But after more research, which I should have done in the first place, I found that petroleum based spray paints can harm birds. Is there anyway I can put a clear non-toxic sealer in the bowl or is the only choice to strip it back down to the plastic?