I mix my luster dust with a little bit of cake decorators rose spirit, which is 95% alcohol. As above, you can also use vodka as an alternative to mix with it. Give it a go, you'll see it works beautifully!! 
I just found some Duff metallic silver spray at Michaels... comes in a can - sort of like spray paint - but edible. It goes on fondant or gumpaste. I haven't used it yet, so I can't give feedback on the quality... hope that helps!
also, colour your icing yellow or grey first, helps make a much stronger colour.
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I know u can paint on bc, but I don't know how easy it is to do a large area.
Lustre dust is not the same as pearl dust. Lustre dust has a metalic colour, which is relatively solid. Pearl dust adds a pearlescent sheen with a hint of colour.
xx
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