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Buy a large plastic (Rubbermaid-type) container (at Target or Wal-Mart for under $10.) Pour a couple inches of plaster into the bottom of the container. After the plaster has cured for a couple weeks, soak it with water. Now you can put pieces in there, put the lid on, and they will stay damp. This is great for pieces that you plan to assemble later such as parts of a teapot or sculpture, for handles, and in-process work. Every now and then the plaster will start to dry out, then just re-wet it.