Cheech27,
I used Model Master enamels alomost exclusively, both the standard FS line as well as the excellent MM2 selection. The MM2 paints were manufactered thinner in viscosity mostly by accident during production batch mixing. There was slightly more carrier chemicals in the batch which lead to them being fairly airbrush-ready out of the bottle. To answer your question, having used the MMII paints; they are for the most part airbrush ready with your compressor set at around between 15-to-20 psi. I have had excellent results with spraying fine lines for camo with just a few drops of T.R.P.S.(turpentine replacement paint solvent) added. You can simply substitute with good ol' mineral spirits with the same great results. MM2 paints are exceptional when brush-painting out of the bottle as well. There has been some chatter over the web that Testors may convert all their enamels to the same MM2 formula. If this is true, it is quite possible that Testors Model Master enamels will be the finest hobby enamels on the market; but you know how rumors are.
* Facts regarding the MMII development were referenced from the Model Master "Modelers Technical Guide", Item #2020C, copyright 1998.
Testor USA
620 Buckbee Street, Rockford IL. 61104
http://www.testors.com
Greg Williams
Owner/ Manager
Modern Hobbies LLC
Indianapolis, IN.
IPMS #44084