We needed a head model for a costume helmet fitting, so we made a head mold from Alginate and cast it out of the plaster Hydrocal.
Mold: Alja-Safe from Smooth-On
3-Lbs bag should be more than enough for a bust
http://amzn.to/1jdbSdS
Mother Mold: Plaster Bandages
Best deal is from Pacon Craft
It's $50 on Amazon, but way more than you need
http://amzn.to/1mmYCmx
Casting Material: Hydrocal (2 x 5lbs packages)
http://www.dickblick.com/products/sculpture-house-hydrocal/
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