This thread has some detail on the weathering of My BV F-100.. My first real scale jet! From the bottom of page 3 on.
http://www.rcuniverse.com/forum/rc-j...bvm-hun-3.html
I used a combination of Airbrush, artist oils, dry paint pigments, and guess work.. I learned a some techniques from the very good RCJI Articles that Sean Mchale wrote.
My subject was a well used Vietnam combat veteran. These plane were dirty.