Hey guys, sorry to hear what happened to zentheman.
I actually came across a thread about City Painters a while ago in Renotalk and decided to engage them to work on my parent's place. The result wasn't too bad and they were pretty neat laying plastic sheet before they started, so I got them to do my condo unit recently also for $550 (which is pretty affordable).
I had a bathroom that had pretty badly flaking ceiling too, and i'm pretty thankful it went well for me. I made sure they scrapped the old paint, plastered the uneven surface and applied primer before the fresh coats. I think zentheman's bathroom ceiling problem might be more severe, as it has been roughly a month since then and my bathroom ceiling seems like it's holding up.
Not sure how I could help you out, but the foreman Ah Meng(?) told me that it was because of the humidity in the bathroom, so we got a KDK fan for about $68 to let the air circulate a bit and there seems to be no problems till now. From my experience the boss is okay lah, he seems to be pretty busy. Hope you managed to contact him with regards to your problem.
Cheers.