Airbrushing is the way to go in your situation, and with a little practice, you'll see that it gives excellent coverage. Besides normal coverage, you can quickly learn how to paint fine lines, and al sorts of excellent designs.
The one thing to remember is once you have your paint mixed to the proper consistency, is to write down the fomula so that you know what to use in the future.
Too thin you get runs, too thick you get splotching. Most Airbrush's come with recommendations for mixing, so its fairly easy to use them.
Sorry had to run to the printer.. Aditional info follows:
You can start with the smaller kit that has a can of pressurized air, so you can judge for yourself just how nice and beneficial an airbrush can be. My local store has an airbrush set with can of air ( funny that ) for 49.95 - good price and the airbrush set is top-notch.
A top of the line airbrush will cost you 75 to 120 bucks, but again, you get what you pay for.
Most brushes come with a single nozzle attachment for smaller projects, and a larger bottle attachment for more spray time. There are two types of brushes - Gravity and Siphon feed -but the page that explains this easier than me writing it all out is here :
Must read basics:
As long as you stay with the manufactures suggested recommendations for paint and mixture, you'll be fine.
There are also many sites online that deal with airbrushing and give recommendations and tutorials. Here are a few can't miss sites for information:
A large list of links:
My two favorites:
The larger expense is an air compressor, but to be honest the first time you use it you'll be glad you bought it.
Hope that helps a bit,