I decided to sculpt using WED (Walt, E, Disney) clay i had several options including oil based clays such as chavant NSP or la beau touche, good for fine details and the bonus of not drying out are slower to use the initial balking out of a sculpture takes longer. water based clays speed up the balking out considerably but dry out and crack and you have to wait for the clay to become leather hard before you can start sculpting the finer details. WED clay seems to be the happy medium between the two and is the reason i chose to use it.
"Wed clay has become quite popular in the film industry for creating large detailed sculptures. Although it is a water based clay, Wed clay dries more slowly and has many of the same sculpting qualities of oil based clay. Requires a spray bottle of water for maintaining moisture and for smoothing. Can be used for mask sculptures as well." http://www.monstermakers.com/product/em-217-wed-clay.html
casting in resin
"Because they shrink, cast resins cannot be easily reinforced with internal armatures like steel rod. The resin shrinks around the unyielding steel-- and is split as if by a wedge. Resins can also tear themselves apart. Polyester resin, for example, goes through a jelly-like state before becoming hard. In thicker castings or those catalyzed too hot, the core is already hard when the outer areas gel. The gelled material must shrink as it becomes a solid, but when it cannot compress the hard core, it splits on the outside instead." http://users.lmi.net/~drewid/resin_faq.html
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