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I have three plaster positive in my garden coming out of the ground I
did using a dental alginate (the stuff the dentist uses to make molds of
your teeth) as the negative. I have done them with the plaster strips
but the detail is greater with the alginate. The only problem with
alginate is that it can be used only once where the plaster negative can
be used until it falls apart (loosing detail each use). One word of
advice is the you should still use the plaster strips on the outside for
stablilty. The advantages of alginate is you cannot burn the face like
plaster, it smalls of mint, and it is very quick (less than 2 minutes).
You can also open your mouth or stick out your tongue, although then the
positive can be tricky. Alginate is also easy to remove, ask the model
to wiggle their face to loosen and remove. Disadvantages are that you
have to be very, and I do mean very, fast. Really two people are
necessary, my son was a great help and my husband was useless! It
doesn't work well for wax, you could make a plaster positve then again
make another plaster negative in this case. Hope this was of help.
Sandra in AL
> I have finished making a mask using plaster strips but would like to make a
> plaster of paris positive from this negative. What would be the best way
> to preserve as much detail as possible? What releasing agent should I use?
> Will the negative cast be ruined in the process? Thanks for your help--
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