Erik: I use ordinary Methyle alcohol (Husholdningssprit!)It works fine, but it tends to dry up very fast. Tamiyas own thinner stays "wet" a little longer. As for airbrush controle, just practice on an older model, and only apply a small ammount of paint at the time, in that way you can build up the camoflage pattern in thin layers, insted of one thick layer.
Best regards
Jacob