I have a bottle of pearl luster dust and a bottle of vodka. I have spent the past hour changing the ratios of dust to vodka and I don't think I'm doing this correctly. 
I see brush lines and my fondant pieces are still sticky. 
Should I be using a certain type of paint brush (I'm using a tiny one), or should the mixture be thick like paint (it is runny)? I'm giving serious consideration to mixing the vodka with orange juice and forgetting the whole thing. 
Any help would be appreciated!
If painting a large surface (cake top and sides), I actually use a foam brush. I find it makes the work faster. It does soak up more dust/vodka though. For small areas, I use a flat end brush with soft, natural bristles.
I mix mine until it is paint-like consistency but still thin enough that it moves when the container is tipped to one side.
A side of vodka and orange juice also helps a lot 
Yes, definitely if you are painting larger areas, use a larger brush. Good quality artist brushes also help reduce the streaking--brushes with sable bristles work very well.
I add my vodka to the dust with a medicine dropper until I get the right consistency. Keep the vodka on hand so that you can add more as it does evaporate.
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