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Press the Fondant Into the Cake
(c) 2010 Elizabeth LaBau, licensed to About.com, Inc.
Once you have taken care of any excess fondant at the bottom, take one hand and firmly press the fondant into the sides of the cake, removing air bubbles and firmly sticking the fondant to the buttercream. Press down with the bottom of your hand to create a firm corner around the bottom of the cake.