This is how I did it.
I first primed the plane with White spray paint, the cheap stuff from Menards. I drew over the panel lines with a fine black permanent marker. Then airbrushed the kit with Polly Scale olive drab and neutral gray.
Then using a 10/0 brush, I painted small dots and lines over the panel lines using Tamiya X-11 "Chrome Sliver". Then I gave it a coat of Future, put the decals on with Micro-sol, did some Sliver dots over the decals, then gave it a flat coat. I then used Black, Burnt Umber, Raw Sienna, Light Gray, and Dark Gray chalk pastels and about 30 Q-tips. I rubbed a Q-tip on the pastel and rubbed it in the wind direction of the model. I used an old paint brush to put pastels on to simulate gun powder, fuel, and exhaust stains. But the Q-tips were used for the flak stains. Finally I put on another flat coat to seal the pastels.
Thanks for all the feedback,
Bernie the K.