I see some comments about using plaster of paris, and am concerned that someone might try that. Mixing plaster of paris with water creates an exothermic chemical reaction--meaning it generates LOTS of heat. If you try to cast yourself in plaster of paris, or even put on a t-shirt and cover it in plaster of paris, you will burn your body. Please don't do that. I don't know what kind of plaster is the correct kind, but it isn't what you find in craft stores!