Hi!! I need help badly. I just purchased a coop in NYC and in 1 of the bedrooms, the plaster ceiling was cracking apart. Its just basic plaster on concrete, its not ornamental, plus the room is small 10x10. So i scraped off all the plaster on the ceiling just leaving the bare concrete. Whats a good treatment for this ceiling, should i replaster? Is there any other stuff that i can put on there. The concrete has lines from the molds on it. I would like the ceiling to be smooth and paintable. PLease help someone.