Positive Clay Sculpt to Positive Plaster Mold for Vacuforming

Discussion in 'Star Wars Costumes and Props' started by BrianFinn, Jul 30, 2015.

  1. BrianFinn

    BrianFinn New Member

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    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 :)
     
  2. Teddz

    Teddz Sr Member RPF PREMIUM MEMBER

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    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.
     
    Last edited by a moderator: Nov 8, 2018
  3. BrianFinn

    BrianFinn New Member

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    Thank you :)
     
  4. division 6

    division 6 Master Member

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    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.
     
  5. TUBBYO12

    TUBBYO12 New Member

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  6. division 6

    division 6 Master Member

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    Plaster breaks down to fast.

    You can also make molds out of hard woods, acrylic, high density foam.
     

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