Hey SF,
I've had some experience with polymer clay and making multiple part silicon molds, then casting it with resin.
However I've recently been working with wax clay (chavant NSP and clayette, and probably monster clay as well soon) and encountered a problem.
Usually when molding polymer clay, I would block off the half portion with clay before I pour the silicon mold, then followed by a plaster mold.
The problem with wax clay is that I'm not sure how to block off one portion should I plan on making multiple parts molds. Clay on clay, even if its a softer grade could damage the master mold. I've thought about freezing the clay as well, and even using cardboard as partitions, but I don't think this will work well too.
This is one of my latest works that I plan on casting.
The only solution I can think of is to pour the mold all over and simply cut it to pieces from there, but it sounds crude.Any thoughts would be appreciated.