AI am trying to understand what you mean by molds, do you mean one of those molds for fondant details to add on your cake? Like the silicon ones? Or a mold for a full size cake, like a Bundt for example?
Why does it have to be flexible if it's for display? Won't a carved Styrofoam dummy do? - or is it a novelty cake kind of mold? Plaster won't do?
AWhat about piping gel? I think I've seen on cake boss where he used it to fill a mould but I'm not sure, so correct me if I'm wrong.
ASorry just realised it was isomalt he used. I googled it and came up with someone who used gelantine to fill some moulds, maybe you could try that?
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