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>I have been experimenting with drape molds in my high school ceramics
>I made solid molds by filling plastic bowls with plaster. The students
>invert these and build a pot on the outside. They have been using
>embellished coil designs instead of a solid slab of clay to cover the mold.
>The problem is that by the time they finish ( it usually takes 3 to 4 class
>periods) it is very difficult to remove the pot. The pot seems to really
>stick to the mold when the clay is still fairly moist. If we wait until it
>is closer to leather hard, it tends to crack. I realize that the clay is
>shrinking and that is why it's cracking, but I don't know when the optimum
>time is to remove the pot. Are the kids presing onto the mold too tightly
>when they construct their coil designs? Also, has anyone found any
>interesting containers to make molds out of that are a bit different from
>the traditional bowl? I'd like to be able to do platters etc. Thanks!