Perfect Glow Sunless is a water based solution. It is thinner that other solutions on the market as it is formulated without thickening agents that can clog your gun. It is recommended that no more than 2-2.5 ounces (max) be used on an average size client.
If you experience any dripping, beading or a very wet application while spraying then that means your gun setting is open too high. You will need to close up the gun flow a little bit.