Thanks Wurger , next problem; I just sprayed Vallejo Semi-matt aluminum and it was thin in the bottle but thickened and was unusable in the airbrush. This is a brand that I don't use much and the paint is less than 2 years old. Alcohol did not keep it from turning into oatmeal. At least I was able to get it on by doing a few drops at a time into the cup. The gloss black was fine; is this something metallic paints are prone to?
Sounds like a waste of good Vodka my friend