I'm making a cake with perishable filling and buttercream frosting. If I use mmf decorations and refrigerate the cake, will I run into any problems? Will the mmf get gooey and bleed onto the bc or maybe dry out and get too hard to eat? If refrigeration is possible, how should the cake be stored? Airtight or not?
I wouldn't refridgerate MMF. Humidity is the enemy of sugar and that is pretty much all it is. But if you have to - how long are you talking overnight? MIGHT be ok if you bring it slowly back to room temp - uncovered so the condensation can dry off.
Maybe someone who knows better will see and post. However, if possible, add the MMF decorations at the last minute.
I do it constantly. I store openly in the frig--uncovered. The fondant will sweat a little when it comes out of the frig but just let it be. It will dry.