The problem with a single action is that ,it drags paint out of the container as it blows over the top of the paint spout. With a dual action it mixes the paint together inside the gun! The most you can do with a single action is covering big areas (even then your more acceptable to get blotching) Also when using a single action its best to strain the paintthrough a pair of panty hose or some kind of paint strainer. you will have to run a thinner paint because you dragging the pain out of the jar. When I bought my dual action gun I almost had a heart attack it was that much better I would say if you could save up for a dual action its worth it's weight in gold. Remember keep them clean, clean ,clean you really got to think like a surgeon the cleaner they are the better they work! :-D
Robby.