Is it possible to use the ganache as a crumb coat and then buttercream as the final layer of icing? Will the buttercream soften the ganache? I am doing another practice cake for a topsy turvy but the possible client may want buttercream instead of fondant.
Yes you can do it, I use this method a lot. The buttercream shouldn't soften the ganache under it.
Thank you so much for your reply. I will let you know how the practice turns out