I need to cover a styrofoam cake with fondant. What do I need to put between the styrofoam and fondant?

I mist it with water. Another CCer told me to do this and it makes the fondant stick nicely.

I just covered a dummy cake last night. I iced it with butter cream first, very thin layer. It stuck nicely to the styrofoam and the fondant covered perfectly.

OMG, I just posted a similar question regarding this same subject. Thanks, I didn't think of just using a layer of bc to the foam before the fondant.