Positive Clay Sculpt to Positive Plaster Mold for Vacuforming

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BrianFinn

New Member
I am new here and would like some advice on making a mold for vacuforming. I have made a vacuum forming table and have a good heat source but am stumped on how to create the mold. I have very hard natural drying clay sculpts but in my research have come across no one recommending to form right over this. I have seen a lot of people use plaster to create their molds. I was wondering if anybody knew any good methods on how to take a clay sculpt, cast it with whatever material and then pour a plaster mixture into that casting. Any advice would be greatly appreciated. I have looked into Silicone 73-20 but that stuff is far out of my price range and I have no familiarity with it. The plaster I have is Plaster of Paris btw.

:) Any help will be greatly appreciated :)
 

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Teddz

Sr Member
RPF PREMIUM MEMBER
You can try using 100% silicon (in a the tube available at a local hardware store), glycerine, acrylic color (to tint it) and try that for your silicon mold. There's some youtube vids that show what exactly you'll need for this process. I personally haven't used this method but, give it a shot as I've seen some decent results with it.

Here's one vid that outlines this process.
 
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division 6

Master Member
Sculpt with WED clay.
Let stiffen till it's leathery.
Vac over it.
Fill with Ultracal 30.
Tune up cast and you're good to go.
 

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