Is it the crumb coat that won't stick? It may be too stiff. Try mixing some of your buttercream with water to thin it out and then pop your cake in the freezer for 15 minutes and then applying your final coat!
I need to make a GF chocolate cake. I was wondering if anyone has bought Betty Crocker or King Arthur GF cake mix before and turned them into an extended recipe by adding pudding mix? I don't know if this will work. Can anyone help? Thanks!!!