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casting how-to's?


Date: Thu Sep 06 2001 - 17:08:29 PDT


I've officially jumped back into the fray--first day of classes and I'm exhausted! (But also incredibly psyched...)

I've got some questions....

When I was in college, we made life-size heads/busts out of clay. Used metal strips to divide the finished clay sculpture into 2 halves, and applied plaster over the wet clay to make a mold.

When the plaster was dry, we removed the clay, cleaned the mold, put it back together using thick rubber bands, and poured in a mixture of concrete and pulverized marble. Removed the mold and then sanded (forever) on the cast bust.

While I remember the basics of this, I've forgotten several critical bits of procedure:

For starters, would something have to be put on the clay to allow it to release from the plaster?

I remember the plaster being at least 2" thick. Does anyone know what it really should be to produce a firm mold and how long it needs to set?

Before pouring anything into the mold, would IT have to be coated with something to keep the concrete/whatever from sticking too badly?

Since I (still!) don't have a kiln that's operational, I thought this might be a neat way to allow some of my advanced kids to work with clay and also learn a new sculpture process.

Looking forward to hearing from the lists' collective genius!