I want to remove popcorn ceiling in a 7' by 14' room and turn it into a smooth ceiling. I have just built this room. The walls are not yet painted, so now is a good time to do the ceiling.
I know how to remove popcorn by spraying it wet and scraping.
The question is what to do after the ceiling has been scraped. It is poured concrete, with some visible depressions, hard to say how deep, probably 1/2". The ceiling also has a tilt to it. It is most pronounced along the shorter 7' wall with about 2" drop.
Now if I were to go for a level ceiling, that would require a lot of compound to fill that slope. Just to estimate (assuming the slope does not run the entire length of 14' but only half), 7' x 7' x 1" = 49 sq ft. x 1" = 4 cubic ft = 30 gallons of mud. That is a sizable amount of mud to buy, mix, and apply.
Is it actually worth being a perfectionist here? Can I get away with simply smoothing out the ceiling, hiding most noticeable blemishes and leaving the slope as-is?
Either way, what compound should I use, and what is the recommended way of applying and smoothing it?
Edit: Thank you for your answers. Both provide great info, I just wish I could mark both as "the answer". Quick update: scraped popcorn last night. It was quite easy (not nearly as difficult as some DIY articles lead me to believe). After hearing opinions here, definitely not going to level the ceiling. I bought this type of compound for the job.
I have an assortment of drywall knives. Which knife should I use? What primer should I use? Once sanded smooth, should I paint the ceiling -- if so, what type of paint should I use?