I recently just started my first mod (other than cutting a window). I decided to sculpt a face/head from Super sculpey for part of my case. I put about 12-14 hours of work into it and do not want to ruin it with test painting. I decided that I should make a mold of it and then cast replicas of the original to use. I looked around for materials but am afraid that if I use the wrong material it may bond to the original sculpture and/or possibly have some kind of weird chemical reaction witht the super sculpey.
Does anyone have advice on what to use to make the mold and relief of the original sculpture?