Did I ever mention I hate painting? I loathe spray painting!
TLDR: Had a lot of problems the first 3 days of painting the ceiling, but I have figured it out and I see the light at the end of the tunnel.
I started painting the ceiling with quite some enthusiasm. I got the walls taped off, the floors covered (just the quarter I was working on). Then the problems started. I had never painted latex paint thru my HVLP sprayer. This is the Wagner Spraytech Control Spray Max. It was useful and helped me paint the closets that I built. The mistake I made was thinking that painting with latex was the same as painting with the specialized cabinet paint (KemAqua Plus from Sherwin Williams).
The first day, I almost gave up. The nozzles got blocked every 20 minutes or so, and I had to open the sprayer and clean it. Figured out that I had not filtered the paint. Filtering helped but it was still sputtering and blew out blobs of paint. Floeterol, which many recommended did not help.
I started slowly increasing the amount of water added to the paint till I finally got the proportion right. Somewhere around the third day, I dialed in the right amount of water and voila, it was painting well.
One problem with watered-down latex paint is that it is not as strong as unwatered paint. Takes a long time to harden and is very easily removed from a surface e.g. blue painter's tape lifts it off even with a day of drying.
It is also physically hard. Wearing a mask, you cannot breathe or see well. You are standing on a step ladder and spraying with your hand above your head. Climbing up and down when you have to move the ladder. I was so tired at the end of each day.
I am quite happy with the results. The ducts, pipes, and wires are hidden.
If you look closely, you can see areas that are a little patchy, but I am following the mantra of "Perfection is the enemy of getting it done".
Hope the pictures show the sequence and how much it hides the ceiling. You also see patches on the left and a lot less on the right in the last picture showing improvement in technique.
ETA: I had hoped to be complete in 4 days, but I am only about 40% done. It is a lot harder and more time-consuming than I thought.