Square Cakes Covered In Fondant
Decorating By txmom2 Updated 10 Dec 2009 , 7:11pm by ApplegumKitchen
I've seen where those who use ganache form their sharp corners with the ganache and then put the fondant on. It has to be a ganache that sets up firm.
CC Article on achieving square corners on buttercream cake:
(Also helpful prior to applying fondant.)
http://cakecentral.com/articles/109/how-to-frost-a-square-cake
Indydebi demonstrates frosting square corners:
http://www.cakecentral.com/cake-decorating-ftopicp-5396443-.html#5396443
HTH
Yes the SETTING ganache is a great tip - but also you need to have your fondant really thin - 1/8th of an inch or less - when your fondant is thicker you will end up with the rounded edges.
Use two smoothers to form a right-angle and this will also help to achieve your sharp edges
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