I am covering a couple cakes in fondant, does the BC have to crust first? I use water to smooth my frosting so it's still tackey. I don't want the color of the fondant to run...Red & Blue
The buttercream I use crusts pretty quickly, so by the time I get my fondant rolled out, it's already crusty. I also like to chill my cakes briefly before the fondant goes on. Maybe you can set your cakes in the fridge for a few minutes while your roll out your fondant?
I have never heard that you had to have a crusting icing for fondant. I'm sure those that make IMBC put fondant over it with out a problem.
I use a crusting BC under my fondant, but it doesn't have to be a crusting one I don't think.