Last year I picked up a bust, a statuette, and two rabbits. They seem to be made of a plaster like substance. Anyway, I tested the rabbits in the garden. All seemed well until after the first few frosts. The covering (paint or ?) started to flake. I'd like to cintinue to use them but need to stop the cancer. Additionally, before I put out the bust & statue, I would like to coat them with a protectorant. Any suggestions?