ADW123, I have seen your posts recently about painting model planes. The best choice is to use color tissue or don't paint at all. If you choose to paint your models, then yes go with an airbrush that way you control how much paint to put on a model. To learn about airbrushing, read the plastic scale builders forums. Spray painting with cans adds a lot of weight. You can try this paint from Michaels
http://www.dmcolor.com/products/
This paint goes on light and does not add too much weight. Stay away from all other spray paints, too heavy for freeflight.