I'm decorating a dummy cake this weekend, covering it in fondant. Can I just use buttercream icing underneath or will it go bad? Is there something better to put underneath instead? Please help!! Thanks!

I use piping gel and have had no problems.

I've used a super thin layer of buttercream, some people using piping gel and some even just use a water bottle to spritz the dummy w/ a light mist of water. All of these techniques work.

A light spritz of water or rub the foam with shortening. Make sure you soften the edges first or the fondant will tear.

I have done all of the above. Lately, I have just been spreading a little shortening around the dummy. I use a layer of Butter Cream if I am going to be doing quilting or imprinting of any kind. It makes a nice "puff" when quilting.