Pics of Saturn V with almost final coat of white.
This model is not for showing off excellent assembly techniques. I decided to use it instead to relearn airbrushing.
I finally found that a 1:1 enamel to thinner (both testers) at 20psi using a Badger Anthem Airbrush works very well with flat white for preventing that grainy rough texture. In fact a .75:1 thinner to enamel would be better as the 1:1 takes several coats to cover and will run at the drop of a hat.
These pics are showing both the good and the bad. What can be seen around raised detail are the remnants of various attempts that were all failures.
http://www.cronusengineering.com/cronuswarp/SNITZ_FORUM/photo_album_cat.asp?sqldtl=1