Can You Get Imbc Smooth Like Buttercream
Decorating By camomama5 Updated 4 May 2011 , 8:04pm by lilmissbakesalot
If by "set" you mean crust, then no, it doesn't. You can absolutely use another type of buttercream on top for piping if you want to, but imbc pipes beautifully. In terms of smoothing, get yourself a good bench scraper tool and use that to get perfectly smooth sides and corners. The beauty of the meringue buttercreams is that when you chill them, they get solid and can be smoothed with a firm pressure. If you mess up, just add more and back into the chiller it goes!
What if I ice the entire cake in IMBC and then used reg buttercream for borders, decorations, etc except for flowers that need to be royal icing and gum paste, fondant. Thanks so much!!!
I've iced my cake with SMBC and happened to not have any left to decorate 
Soo....I had to make buttercream and it was fine. Of course you have two different textures going on (but hey fondant and buttercream is the same deal), but if that doesn't matter, then you're fine. 
Now, I have no experience with royal icing or gum paste, so I can't answer your question. Although I'm sure someone else can. 
Personally, I wouldn't use a different buttercream for decorations. May I ask why you want to do this? IMBC is softer than an American buttercream, but it can still give crisp lines (if that is why you are leaning towards a different type of buttercream for the borders, etc). Since it's a wedding cake, you will want a more cohesive look to the entire cake and I'd be afraid of having too many different 'looks' - kind of like using several different fonts in a typed article, if that makes sense.
Of course, not knowing your overall design, it may be perfectly fine. . . but my first instinct is to stick with one buttercream throughout.
Well my first thought is IMBC *is* buttercream... LOL. But I get the question.
Yes you can get it really smooth, but it's not a matter of using papertowels or foam rollers. It doesn't crust like the PP said so you have to be really careful with the finish. I would just use more IMBC for your borders... it pipes beautifully so long as it's not too warm. I like to have a couple of bags going so I can let one sit a bit if it gets too soft on me.
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