Latex can't be used for two part molds due to shrinkage and the fact that it isn't heat resistent. I make a lot of molds, usually for my work, that I use for plaster or resin casting. I do have heat resistent silicone and used it to make a Star Wars stormtrooper mold. I'll get a pic of it as soon as I can. Never got around to cast it
Making a figure mold for a simple figure that requires two parts isn't hard.
- Use Lego bricks as a mould box; they won't leak and are very flexible to use.
- Use any oil based non hardening clay to cover half of the figure (use the factory mold lines as a guide)
- Pour the 2 part silicone.
- Turn the mold, remove the clay and cover the half of the mold with a release agent (silicone spray or wax.)
- Pour the second half of the mold.
- Cut all pouring/airing cannels afterwards with a sharp hobbyknife.
This is how I do it and how it's done most of the time for small hobby projects. Before I heard of the legos i always used to make wooden crates and sorts but the Legos really make it easy. Pouring a mold in a boxlike construction with enough 'body' around the subject makes that you won't need a supporting mold. They are just like the Dutkins molds really.
Hope any of this helps.
When you pour the second half of the mold, does the first half need to cure before the release agant is sprayed on?