I took a class on rolled buttercream fondant and it's fabulous. I'm new to cake decorating so I'm not sure if I did something wrong and if there is a way to prevent my problem. I used a buttercream frosting as my crumb layer, put the buttercream fondant on the cake, and put it int he refrigerator overnight until my daughters party the next day. As the cake sat out is was cooling off and it started to sweat...so there was moisture on the outside of the cake fondant. Did I do something wrong? and is there any way to prevent this from happening?
Unfortunately, there's not really a way to prevent it.
I suppose you could put it in front of an oscillating fan....the moving air might help to evaporate the moisture more quickly.
You didn't do anything wrong, that's just what happens. If you take the milk carton out of the fridge for any length of time, it will sweat, too.