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Lesson Plans


Re: Plaster mixing for carving???

From: Ann Heineman (aheinema-state.edu)
Date: Thu Mar 09 2000 - 13:21:31 PST

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    Dear Sharon:

            When I mix plaster and water, I generally forget about the half
    water/plaster formula. Instead I fill a gallon bleach jug (top part cut
    off) with water to halfway or little less. Then I sift in the plaster
    powder until it builds up an island in the center of the bowl and the
    plaster stops sinking so quickly. If the top layer of water looks a little
    creamy, it is time to stop adding plaster and stir it up thoroughly,
    squeezing lumps out with your fingers. I do not shake it. After you have
    poured the plaster into the molds, gently pick them up about a half inch
    off the table if you can and let them drop back--this will "burp" out any
    air bubbles in the plaster. Depending on the humidity of your climate, you
    may have some water "sweat" on the top of the plaster after it sets. Blot
    it off and try to put plaster molds in a sunny dry place for awhile.
            Hope you have success with your lesson. Please write back if you
    need further clarification.

                    Ann-on-y-mouse in Columbus

    >Thanks for any suggestions!
    >
    >Sharon
    >sharonbk

    Ann Heineman....aheinema-state.edu
    Greensview School...Upper Arlington City Schools
    (614)487-5050...Voice Mail 487-6456 Box 522
    aheineman-arlington.k12.oh.us 

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