This how you prepare your cake for a ganache coating.
1. level your cake.
2. Put your cake on a board that is the same size of your cake.
3. Put a thin crumb coat layer of icing on your cake.
4. Pour the ganache over your cake right after you get your chocolate melted in the whipping cream.
This is how you make a ganache.
Use 14 oz of Merckens chocolate to a half a cup of whipping cream.
(finely chop up 14oz of merckens to be added to the whipping cream)
Heat your whipping cream until it is just under boiling take the whipping cream off the stove and then taking your merckens melts that are finely chopped up add them to the whipping cream this will make a very smooth surface almost like glass. Now pour over your cake. Be sure that you stir you mix to the point were it looks very smooth and no lumps. Enjoy!
This is real easy to do the secret here is using merckens coatings they are perfect for this. I hope this helps everybody. 
Awesome! Thanks!
Just to clarify though that semi sweet chocolate may have a different recipe since white chocolate reacts differently.
I use 8oz semisweet chocolate and 1/2 cup whipping cream. Heat both in doubleboiler together until melted then pour over cake immediately (this is for cakes that are not coated with BC. You can pour directly over unfrosted cake)
I can't wait to try the white chocolate ganache!!!
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