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reelnmn

Chalky Plaster Molds

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What material are you using?

Most of the "plasters" have portland cement in them. This material forms a chemical bond with the water. I think this is called "hydroset". Anyway, if there is not enough water, the surface will dry out prematurely and chalk. I always try to keep a new mold wet for about 24 hours to be sure that there is enough water to form a rock hard set.

One clue is that the top half is the one that chalks. If you bake both at the same time, the top one is the one that was cured for the least time. Keep it moist for another day, then dry it.

hope it helps

jm

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