Buttercream is all I have worked with. I'm adding a few chocolate clay items to my newset cake for the first time. The only problem I seem to have is getting it perfectly smooth. I have done the VIVA method, but can never get it right. Various reasons, I have figured out. Icing to "airy" too much icing, a non crusting recipe
etc. Thank goodness I'm not professional, lol. I'm still looking for that "perfect recipe" so I that each time I make it, it wont be completely different to work with.