The clay I used is a wax-based clay which means that it won't dry out. This particular batch was made by a fellow artist, but is very similar to Castilene in that you have to use a heating lamp in order to soften up the material enough to work with it. Once you get to the later stages of the sculpting process the cooled clay makes for a firmer surface that makes it easier to do fine detail work.
Some people use polymer clays, which are desirable because the clay doesn't dry out and can be baked on low heat to harden it solid when the sculpture is finished. However, baking the clay can make for a difficult time, depending on the intricacy of the sculpt, if planning to do molds and casts of the sculpture. When doing casting and molding, the clay is then no longer the finished product and is often destroyed when releasing it from the mold.
I decided to try the Castin' Craft Mold Builder and Mold Release, and Amazing Casting Resin on my first try with molding and casting a sculpture. The process is fairly straight forward. Mold Builder is basically a viscous liquid latex rubber that once painted on a sculpture dries to a yellow rubber coating.
The directions suggest doing ten coats of the Mold Builder and also suggests using Castin' Craft Resin spray on the clay to coat the sculpture before using the Mold Builder. I did not before I started using the Mold Builder but I think it will be alright anyway since I partially peeled the mold off with no trouble.
Here is what the EWJ sculpt looks like with the Mold Builder applied.
So the next question is which method would be best to extract the clay from the mold? Cut down the side? Or cut the mold in half and do two casts that I would have to glue together? Yet another question that I'll have to figure out later is, how do I attach the head to the mighty mugg body and to where it is sturdy and still does not touch the rim of the neck?
