OSB, in my experience, doesn't take too well to that kind of tooling. If you are using 1/2" that will result in 1/4" tabs. They'll break easily. I believe that you can buy OSB that's tongue and grooved already.
Additionally, water based paint will cause the strands to separate. I've had SOME luck priming with Kilz before painting with latex.
I used 1/4" pre painted hard board on my ceiling. The paint(? maybe some sort of plastic sprayed on) is slick and shiny, which really helps with lighting.
If I were to do it again, I'd use 1/2" tongue and grooved ply wood and paint it with a high gloss enamel.
'The true soldier fights not because he hates what is in front of him, but because he loves what is behind him.' G. K. Chesterton
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Last edited by Gene Howe; 06-19-2011 at 11:21 AM.