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Phil-- The Polly S pre-mixed color that comes closest to the prototype color appears (to me at least) to be Grimy Black. None of the Poly S grays comes close to the prototype GN color, or to any of the grays used by model manufacturers (Athearn, Atlas Intermountain, etc.). Your best bet might be to complete your modifications or detailing work, then mask the model and airbrush all of the area above the white stripe (as well as the pilots, steps, trucks, fuel tanks, etc.) with Grimy Black. --John
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