Looking for a recipe to make a gel like substance to put in my mold.   Doesn't have to taste good - not going to eat the cake (for display).

Basically wanted the gel so that it will be flexible (rather large mold).

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?

I have a large silicone mold I would like to put on a dummy cake.  I find the gumpaste is not something I want to work with for this mold.

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?

Homemade gummy [bear] mixture:

http://www.wikihow.com/Make-Gummy-Bears