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Larry, I used a spray can of dark gray with a very small amount of metallic flake in it. The latter works well to your point of hiding fingerprints or small blemishes. Click on the pic below and zoom in and you can see the very slight texture the metallic provides. My panel lettering is white on clear labels and they contrast nicely with the dark gray. I've had no problems with sun glare or reflections while in flight. Regards, Dave
Larry - The biggest thing is glare and reflection. You should keep those to a minimum. Usually a dark flat finish will accomplish that. You may considered extending the glare shield or pushing the panel further under it. Sometimes at certain angles to the sun through the transparent cabin top causes some instrument view problems. The dark finish should apply to the top of the glare shield and some pilots feel the top of the cowling also. My two cents.