Hi there, ive only made a few cakes so no expert, but when ive made a modle i put the on greaseproof paper and then in a tuperwear box, just those cheap butty box type you get from tescos and leave somewhere cool, as i did leave one near the tumble dryer and it melted a bit, so cool place.
this might not be what your supposed to do but its worked for me
If you are using modeling clay, and not an edible product like gum paste or modeling chocolate, even though it may be non-toxic, it should NOT come in direct contact with any part of the cake that will be eaten.
As for storage, if they are made of edible products like fondant, gum paste, or modeling chocolate, they should be stored away from heat, light, and dust, but will need some air to circulate around them so that they dry properly.
HTH
Rae
If you are using modeling clay, and not an edible product like gum paste or modeling chocolate, even though it may be non-toxic, it should NOT come in direct contact with any part of the cake that will be eaten.
As for storage, if they are made of edible products like fondant, gum paste, or modeling chocolate, they should be stored away from heat, light, and dust, but will need some air to circulate around them so that they dry properly.
HTH
Rae
I agree with BlakesCakes, I put my fondant/gumpaste letters and numbers in a shoe box with holes in lid and all around HTH
Hi. If I make models from modelling clay for a cake which is to be decorated in around a week - how best do I store them? Thanks in advance.
Wait, are you inquiring about polymer clay/Play-Doh, or chocolate modelling clay?
Theresa 
It's Mexican Modelling Paste (sorry, I didnt realise that was what I was going to use at the time of posting).
RE: BlakesCakes wrote:
If you are using modeling clay, and not an edible product like gum paste or modeling chocolate, even though it may be non-toxic, it should NOT come in direct contact with any part of the cake that will be eaten.
Can I ask why they shoudl not come into contact with the edible parts of the cake 
(sorry if this is a ridiculous question!).
Thanks
Mexican paste is edible and it can come in direct contact with the cake. It should be dried in the same way I mentioned above.
As for modeling clay, it can leach out undesireable elements once it comes in contact with any acid ,grease on/in the cake, or moisture. At best, that would be an unappetizing color and at worst, something that shouldn't be ingested.
It's always best, if you're unsure, to mount such an item on an edible plaque of gum paste, fondant, mexican paste, pastillage, or chocolate.
Rae
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