Well was that (light scatter off the walls) ever a problem in it's previous incarnation? What sort of material is it, I mean if it is gel coat fibreglass you will need to rough it up to get paint to adhere I would think, but if it has flowcoat on it then that can easily be painted. I don't have a dome, but a roll off roof, and my walls are natural timber and don't tend to reflect much of anything. If your scope (assuming it is a closed tube) is pointed at the sky it is unlikely to find any reflection from the usually low level light of screens or red leds. If your running an open truss like an RC then probably a good idea to black the walls.
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