I've only been paying attention to graffiti recently, with a project that is waaaaay more modern than usual for me. So I'm no expert. Someone that has been studying the history will probably be able to share notes. But when I look at proto photos for inspiration, it seems like keeping it low and putting some weathering over the top is the way to not make it stand out... The BlairLine laser cut decals seem to be the nicest to work with so far.
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I still say collectors will buy 75% models or 90% models, but proto guys will buy 90%. So keep your market larger!