do a crumb coat with buttercream, then do a ganache covering, then do fonant? If not can I do ganache then fondant. I am trying to experiment with different techniques. Ideas please.
NO, you can not do buttercream followed by ganache, total disaster!!
Simply put ....No, as you would drag the BC off as you tried to apply the ganache.
Either apply BC then Fondant or Ganache and then Fondant.
Trying to get my taste buds around the thought of Cake then BC then Ganache and then Fondant....something tells me it wouldn't be *pretty* 
Bluehue.
NO, you can not do buttercream followed by ganache, total disaster!!
????? Yes, you can. Ganache goes perfectly fine over IMBC as long as it's cold.
Mike
Add my "???" to MIke's. If the bc has crusted, the next layer of icing, whether bc or ganache, should spread fine.
I am pretty new to this game and never done it myself, but you can certainly do ganache over buttercream crumbcoat, here is a video of an chef/instructor demonstrating it:
http://www.youtube.com/watch?v=y8FH3ULJEt4&feature=channel
I've done poured and whipped ganache over bc, works fine.
The thought that it cannot be done never even occurred to me.
You can always crumb coat with a whipped ganache and finish it off with a poured one if you'de like.
Quote by @%username% on %date%
%body%