I have about 800 ceramic molds made of plaster of paris. These molds are spent as far as ceramics use. I was wondering if anyone knows of a use for old plaster of paris molds. I had thought about using them as a heat mass in my garage. Maybe use my salamander heater to get them hot then let them give off heat for several hours while I work in there. If I stack them in the shape of an oven or igloo and let the heater blow in the center for an hour of so until they heat up a bit. Anyone ever seen anything like this?