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Clay is used to embed the master model during the creation of a two part silicone rubber mold. This way you can do one half first and then the other. You have to use a non-reactive clay to avoid inhibiting the chemical reaction of the two silicone rubber components. To ensure that, your clay musn’t contain any sulfates and needs to be oil-based. When not in use, the cleay should be stored dust-free in an airtight glass vessel. [More...]

In this second installment of my ODN Scanner progress report I will describe how the finished master model (see Part I) is used to fabricate a silicone rubber mold which then can be used to cast resin kit parts.

Because the finished prop was supposed to contain an electric circuit with a super bright red LED and five green sequencing lights, the mold had to be done in a way so that the [More...]