Thanks to good advise from the ladies on this forum I had decided to do air-dryed buttercream roses for a cake. I had planned on brushing the edges with gold luster duster. I have since been told I can't do that on buttercream roses. Said I would need to mix the luster dust with a clear alcohol base first (because it would try faster--I was just going to use clear vanilla), and that even air-dryed the roses would be able to take it. Has anyone else had any experience with this? I really wanted to do BC instead of Royal, but no way am I going to do all those roses on the spot, plus I wanted to gold brush tip them. Help! 
Yes. I've done that plenty of time. Just make sure the buttercream is crusted and the luster dust mixture isn't to thick.
I compared and lemon has like 84% alcohol and vanilla only has like 38% or something.
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