Well, I'm halfway done priming the bedroom in. I finished the trim around the windows and window sills yesterday, so started the process of painting. Due to the residue on the ceiling, I've primed the ceiling in with an oil-based Killz primer. The drywall I'm just using a regular latex primer. I was quite pleased with the way the ceiling came out, considering it is old cracked plaster that had several layers of wallpaper, contact paper and paint.