I have some IMBC leftover from a wedding cake I finished today, and some vanilla buttercream from a birthday cake I did a few days ago. Is it possible to mix the two together? I have another birthday cake to do this weekend and I'd hate to have one of these just go to waste. Thanks for any advice!

Others have combined IMBC and ABC:

http://cakecentral.com/cake-decorating-ftopict-28824.html

HTH

Thank you! The posts were very helpful!

You're welcome, always happy to help.