If you use oil based clay, remember to go with a sulpher-free variety, as it can cause cure-inhibiting problems later on if you use anything but plaster for your molds. use Prima Plastilina or Chavant clay
im going to use a process kind of like how they are doing. im going to by styrofoam and use it to create positives then i will make a mold out of it then i will use fiberglass and maybe something else to reinforce it so i can play airsoft in it.
if you have suggestions then tell me plz im going to get started on this very soon.