AI have been seeing photos of cake coverd in fondant and they have nice sharp edge but I can't seem to get it with my shorting based icing been seeing post about ABC can you get sharp edge with it and how. as with my icing I can't get it pluse I have to let the cake sit over night befor I can put fondant on top is it less time with ABc

many use a high chocolate ratio ganache under fondant, and that gives a very sharp edge. 

but here is a tutorial that might help. 

Ahttp://m.youtube.com/watch?v=6Vgcx5GZTnM

Here's a video on how to get sharp edges...