[gregpark]

I have a quality sprayer and use it when it saves time like doing an entire empty house. I guesstimate the time spent masking windows, doors and floors if necessary and the sprayer clean up time. For one room it would probably be less time consuming to roll it. As mentioned above, for cinder block it should be back rolled anyway when using a sprayer. If there are any items in the room they can be covered in the center of the room with plastic for rolling. I would recommend everything moved out for spraying. Also, you lose 20% of your paint in the air spraying. And I'm not fond using a respirator and body suit which is a must to spray. Rolling is fast and you know exactly how much paint is being applied with gaurenteed no runs. Id have a couple of the fluffiest rough surface rollers at hand for the cinder block