Trouble With Fondant Sticking To Buttercream
Decorating By ness5499 Updated 20 Mar 2012 , 5:30pm by sandyvrc
hi i've never had a problem with fondant not sticking, i would not put water on your buttercream it's just thinning your bc, and will make your fondant stickey, i've seen cake boss put fondant on a thick layer of butter cream but i learned on mine it's better thinner because a got bumps on the cake under the fondant, are you using your fondant smoother it should help the fondant stick using light pressure, you can check out u-tube
You shouldn't have to wait at all if you don't want to. Some prefer to chill their iced cakes before applying fondant just because it's a little easier. The buttercream won't move around as much if it's chilled.
It shouldn't fall off the cake once it's cut - the moisture in the buttercream should be more than enough for the fondant to stick even when you cut it up 
Sometimes it can fall off, but it usually takes a big glob of buttercream with it, purely because the fondant itself is so heavy.
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