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I have metallic iron/steel paint for the engine itself, but I have no idea what to do with the "wall" behind it. I'm aware that the front row of the cylinders is rotated such that much of the wall be obscured, but I'd like to know what do you guys do with it (if anything).
Also, can I add matt gray/black/white to these metallic colors to brighten them up or darken them a little?