You could try ganacheas well. I think the trick is to make sure there is a little space left at the top of the cake wrapper so you can create a smooth edge with the buttercream, I use quite a lot before I put fondant on mine. I make a dome of buttercream and use a palette knife to smooth from top of dome down to wrapper, so the buttercream finishes flush with the wrapper. Does that make sense? A little hard to explain without pictures.
You could try ganache as well. I think the trick is to make sure there is a little space left at the top of the cake wrapper so you can create a smooth edge with the buttercream, I use quite a lot before I put fondant on mine. I make a dome of buttercream and use a palette knife to smooth from top of dome down to wrapper, so the buttercream finishes flush with the wrapper. Then use a cookie cutter to cut circle and i use a bit of old x-ray film (bleach it to remove image and steralise) to smooth the fondant on. Does that make sense? A little hard to explain without pictures.
You could try ganache as well. I think the trick is to make sure there is a little space left at the top of the cake wrapper so you can create a smooth edge with the buttercream, I use quite a lot before I put fondant on mine. I make a dome of buttercream and use a palette knife to smooth from top of dome down to wrapper, so the buttercream finishes flush with the wrapper. Then use a cookie cutter to cut circle and i use a bit of old x-ray film (bleach it to remove image and steralise) to smooth the fondant on. Does that make sense? A little hard to explain without pictures.
^ 
You can also use the thin clear plastic front cover found on some document binders/folders in stationery stores, just cut a piece about the size of the palm of your hand, and round the corners on it a bit. You need to find the folders with the right thickness of plastic on them though...if you think of the x-ray film it should be similar to that.
I set an large empty pan or cutting board over several at a time the rub very lightly, works every time and you can do a bunch at a time.
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