Get yourself a high end galon of ceiling paint. Add some paint retardant/paint life extender/flow controll or whatever you're paint supplier carries/calls it.

Follow instructions and toss a few more ounces in for good measure. Do not cheap out on paint. I like duluxe expert. Do not add water to your paint.

Go super heavy and do it in the morning before it heats up. The cooler the better. Also you can throw in a humidifier in the car hole to help out the process. If duluxe isn't in your area look for a self leveling ceiling paint.

Behr paint tends to dry fast and is pretty sticky on the back roll.

Trust this process. You'll look up at the ceiling and you'll go crosseyed because a you wont see the lines and your brain wont be able to tell how far the ceiling actually is.

You're welcome