Even though there are many different types of modeling clay, the type of clay that works best to make prosthetics is an oil based clay. It has a pretty good shelf life, if stored correctly. Costs very by brand, and if you're doing small projects, a few pounds will last you a while since it's reusable.
There are many types of clay, such as ceramic, oil based, polymer, and paperclay. What you'll want to use is an oil based clay, something like plasticine/plastalina. Monster clay is pretty popular, however unlike most oil based clays that are pliable at room temperature, monster clay needs a higher heat (about 115 degrees) till it is pliable.
You'll want to make sure it isn't in contact with any dust, so keep it covered and also out of sunlight/heat, but that's it, no drying out. It's also reusable.
If using molding clay onto a lifecast be sure that the lifecast is nice and clean first. You then slowly take pieces of the clay and build them up to form your design. Then you'll sculpt the clay, which we'll be going over in the next blog.
You're first step in prosthetic making is to use modeling clay to start making a mold. Using oil based clay is typically the easiest to work with, just be sure to keep it clean and stored somewhere out of sunlight to get the maximum number of reuses.
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