well, it certainly sounds interesting though. There are some things that if you can get more sparkle, even better!
I think I'd try to use it on the frosting before refrigerating (or crusting if you use crusting BC). I've taken luster dust in my hand and blown on it with a can of aerosol air like you use to clean sewing machines or computers and just aim your hand at the cake. It might stick to the still soft frosting or if you were to spray the cake with a fine mist, it might stick to that?
I was wondering about this product, too, so did a forum topic search and found this thread. It really doesn't seem to be a popular item, does it?
Another option: Has anyone used the Preval Sprayer (a home depot/car spray paint kinda gadget http://www.prevalspraygun.com/howto.htm ) . I was thinking of making a luster dust + Alcohol mix and spraying cakes and cookies for that lovely shine.
I'm not at the decorating level where I could justify buying an airbrush system, so I'm always looking for inexpensive ways around it. The Wilton spray in a can is so very limited in colors. 
Anyone have advice or comments?
First put on some piping gel then blow the dust on. Or, put just a little dab of piping gel on a paint brush, then dip in the mystic dust and paint on. It's not for covering a whole cake, it's more for accent.
HTH
Thanks, I'll try the piping gel to get some "stick" and then spray.
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