Exhaust Stains?

[Lucky13]

As we all know, the Skyraider could be a dirty bird at times....
Which would be the best ways to duplicate these?

 

[Lucky13]

 

[special ed]

Have you tried the charcoal artist's sticks from the art department? The are several shades, but are not permanent, therefore OK for display but not handling.

 

[fubar57]

Step 1: Build the model................

 

[Vic Balshaw]

You got in one George.

 

[rmazzoleni]

Some technics:
A more "exhaustive" video
Using oils
Using airbrush +