If you do a search on "Viva" you will find a wealth of information about this method.
Basically, you press a smooth paper towel (Viva) against a crusted bc cake and gently rub to smooth it. You can also used patterned paper towels which will give you a patterned finish on your buttercream.
Good luck.
There is a tutorial in the articles section on the Viva method of smoothing frosting. It called "How to create Faux Fondant." It is near the bottom of the how to section.
I also use a sheet of wax paper and put it on the frosted cake when the buttercream is dry and smooth it out with the fondant smoother.
When I smooth the paper towel I use a long spatula, I think mine is about 12' long.
Deborah
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