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What do I do if I get plaster in my clay?

Slip casting: description

Slip-casting. In this case you buy or make plaster moulds, into which you pour liquid clay (slip.) The slip coats the inside of the mould, so when it hardens and you pull the mould away, a cast piece remains ready to decorate and fire. It would seem like if you poured slip into a mould, you would get a solid chunk of clay. But the slip only sticks to the inside surface of the mold at a certain thickness. You pour out the rest of the slip. When the piece dries it shrinks and separates from the plaster leaving you with a hollow piece.

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