i only use crusting buttercream under my fondant but i always lightly spray water on the BC to make the fondant stick
I use crusting BC and I chill the cake once the BC is on. I don't moisten it before I put the MMF on. It sticks perfectly, and at the same time, if something goes wrong and I need to peel off the MMF, the BC stays on.
Roll your fondant out, let it sit with something covering it and then put your bc on cake, smooth quickly then put the fondant on before the bc crust well. This works for me.
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