I will be making a small ruffle cake with SMB.  I wanted to add a plaque shaped fondant decoration with a name on it to the front of the ruffle cake. Is that possible? will the SMB melt or will the fondant ruin the ruffles? How do I add the fondant to the SMB? Does the SMB harden if placed in the fridge? Thanks!

ASMBC does what butter does in the fridge; gets very firm. Nope, doesn't crust over which is one of the many awesome things about it. It will come back to fluffy softness after a couple hours at room temp. When I attach light fondant accents, I just gently push them on to the surface once it's been chilled a bit, so it can withstand a bit of pressure. it will stay put as long as it's not too heavy.