I have a silly question. I said I would make a dummy wedding cake for this weekend. I am pretty confident that I can do it. Here is my question, the lady would like to keep the whole thing forever, I am to use fondant. Do I add gum text to it to get it to go hard or will it get that way on its own. I've added ready to use gum paste to my fondant to create flowers and they have dried really nicely, is gum tex the same and does it just give flexability or will it dry my fondant also.

When I'm making a dummy cake, I just use regular fondant. It will get really hard on the styrofoam over time. In fact, it gets so hard that it can cut you when you try to remove it. (True story, still have a scar).

If the lady ever does want to remove it, tell her to put it in a plastic bag, tie the bag up, and hit it on the floor over and over. (__Jamie__ from here came up with this great technique).