Painting the OSB makes a _huge_ difference in how bright the room is. In this shot, the bottom panels are 3/4 plywood (so I could screw stuff into them), and the top panels are OSB. You can see a few places where the ink on the OSB bled through the paint a little, I did not prime the OSB. Overall, a big win and fairly easy to do :thumbsup:.
I also painted the exposed foam insulation so it would not degrade with light, that's what you see at the top. This also helped with the brightness.
Pete