I would maybe try brushing a sugar syrup on each sponge layer to keep the cake moist? A cream cheese filling or maybe a chocolate mouse filling might be better than buttercream as buttercream can dry out quicker?
© 2011-2014 CakesDecor.com. All Rights Reserved.
DISCLAIMER: Any posts on CakesDecor.com (CD) are posted by individuals acting in their own right and do not necessarily reflect the views of CD. CD will not be held liable for the actions of any user.