So I am working on a sculpt of a skin and wanted to ask.... If I could use caulk to make the mold, and if I can would I need to use release agent so the modeling clay wont stick to the mold? And also could I use a thin layer of caulk to make the skin in the caulk mold without having it stick together? Or is there a better cost efficient way of doing this? as I cant afford a few gallons of latex.