I use marshmallow fondant most of the time with my cakes but I'm thinking of giving ice cream cakes a go. My question is, what is going to happen to the fondant in the freezer? Is there anything obvious that I should be worried about with this as well. It'll be my first ice cream cake as well as my first time freezing the fondant.
Yes, there is a problem: when you thaw fondant, it gets wet with all the condensation and starts to melt. By the time the condensation dries (which you have to let it do, or it will turn into a total mess), the ice cream will be melted, too. I'd say go with something else, because besides the condensation problem, fondant freezes hard, so if you try to eat it while it's frozen, you could break a tooth.