I have a bathroom in our 1930's house that doesn't have an exhaust fan...and two teenage boys who take ridiculously long steamy showers. We had some mold issues on the ceiling, and some of the ceiling paint was cracking anyway, so I set about fixing things. I scraped all the old paint away back to the plaster. I primed with Zinsser Perma-White mold resistant primer, then painted with two coats of Zinsser ceiling paint. Looked great.
But now every week or so I walk in there to find these gross, sticky orange dots all over the ceiling. They wipe away and leave no stains, but they look awful.
Googling seems to indicate these are surfactants from the paint? Is that consistent with your experience?
I'm planning on putting in an exhaust fan in the spring... have to penetrate the brick exterior and don't feel like doing that when it's freezing outside... which I hope will help, but is there anything else I can do to stop this?
Update: here's a picture of the ceiling after a week of no one using the shower at all