Spray is best if at all possible on popcorn.Scott,
On ceilings how do you tell if it is rollable. Most of the places around here have popcorn texture on them. The last time I tried to roll one, it came down on my head.
I loaded up the roller, and with the first swipe it came down. I lost my butt on that job. Had to scrape the whole ceiling and re-texture. I'm terrified to roll one now, and haven't since.