Drumstick wrote:
One last question though, how thin should the paint be?
The perennial question. Kinda like how much pressure you should use. Definitely the paint can be way too thin or way too thick, but inside that there's a lot of leeway based on how you want it to cover and the size of the nozzle you are using and what you're thinning it with. I like to use Airbrush Medium when I thin paints because it helps prevent drying on the needle and nozzle. Using just water, I'd experiment between 1:1 and 3:1 ratios (water:paint). 2:1 seems reasonable to me to start with.
If you haven't already done this, take some of the plastic from a blister, plastic packaging, piece of card board, or really anything you can throw away and don't care about and prime it using the same primer you use for models. Then start practicing on it. Experiment with different thickness, make mistakes, run into problems, etc. You can learn a huge amount in just one 1/2 hour session of airbrushing that you can apply to working on actual models without messing up your actual models. It's also good to practice cleaning and taking apart and re-assembling the airbrush. It might sound like a lot oft time and trouble, but airbrushing so much fun that it's never felt like that to me. I look up after a good session and realize it's four hours later.