I need to decorate some cake dummies for my portfolio. If I want to cover a cake dummy in fondant, do I have to put anything under the fondant? Do I use BC or does the fondant go directly on the dummy. Should I cover the dummy with plastic wrap before I do anything so that I can use them over and over? Any help would be appreciated. Thanks

Do nothing to it. Just cover w/fondant.
Some people lightly spray it w/water; some coat w/b'cream OR piping gel but really, nothing is needed.
When I tried covering w/plastic wrap it was a big mess The plastic would NOT stay in place no matter what I tried and then the fondant is not smooth ;(
They can be used over & over. Just scrape off the icing (fondant or b'cream) and start over.

thanks for the info. One more question, what about the sharp edges on top, my real cakes don't look like that, should I try smoothing down the styrofoam?

I smooth the edge with sandpaper.

and I also wet the dummy with alittle bit of water to help the fondant stick.