If you are like me, lacking an airbrush and relying upon spray paint cans, there is a new useful flat color out. Auto parts stores now carry a line of Krylon spray paint in "Camo": colors for those who want to repaint their pickup trucks in military camouflage. This four color lineup features "olive drab" and "dark brown". The olive drab is a pretty good Pullman green and the dark brown is a deeper rust color than you can achieve with red auto primer.
David Starr