I agree with you jimmyd30. You need an airbrush. I'm finishing my Tie Fighter and 90% of my model was paint with my airbrush. It is very important to apply several tiny coats. Some parts must be painted before like solar panels, cockpit and the pilot. The ball and the pannels supports must be painted separately. In my opinion, I prefer to apply the gray wash before gluing the parts because it is easier to manipulate.
I will post some pictures of my Tie Fighter probably next week.