This is our newly constructed ceiling. It's made out of unfinished pine and although it is beautiful just as nature intended, it's a little too cabin in the woods looking for our house design, so just like the walls it gets a nice coat of white.
We spray it with primer with the paint sprayer and then two coats of Glidden White on White satin paint.
And just to make sure we get every surface white, we spray primer on the basement floor. Why? Good question, because when you go to buy carpet they will ask if the floor is primed. Priming gives the carpet glue better adhesion, it also acts as a waterproofer since cement is actually porous. And we already had the sprayer out and filled with primer so it was a great time to get it done.