Can I lightly dust a cupcake with gold lustre dust? Trying to figure out whether I should lightly spray a cupcake with wilton color mist or sprinkle lustre dust .... client needs gold buttercream but doesn't want it to be "flashy" ... any ideas?

You'll get better coverage with a spray and it will be quicker than lustre dust. If you want to try the lustre, I think it would only work on a crusting buttercream, or it will get messy quickly. I've only ever used a spray on cupcakes.

AYou can but it won't be shiny. Buttercream soaks up the powder. Now you might try mixing you dust with some extract or vodka and brush it on your bc once it's crusted and see if that works.