Since Spray is suffering the ear thing, I'll add just a couple points. If you're not familiar with the term Tac it, that would be wiping down with a tack rag to remove any airborne contaminates that settle on the finish prior to spraying the color or clear. Tack rags resemble cheese cloth and have a tacky resinous material in them.

Your air supply MUST be very, very dry. And don't even attempt to spray any of the modern catalyzed paints without at least an organic respirator (with fresh filter elements), and preferably a "fresh air system". Lastly, use an HVLP gun, it wastes a whole bunch less material, and when you see how much it costs today you'll appreciate that.