How long does plaster last as a material for outdoor sculptures generally?
gypsum, the stuff plaster is made of, can last for centuries – it was put into Roman coffins and there are examples still in existance wher details have been retained long after the body has decayed. Outdoor scupltures though can vary a lot. It can depend on how sealed they are, how exposed to rough weather, how long is a piece of string really. You can get plaster specifically for outdoor use but not the stuff you buy from craft shops. See the link below. Advice would be to put it in a sheltered spot, shaded from sun. Not sure though, maybe what you have isn’t plaster. It might even be marble but without seeing it, it is difficult to guess.
