Question about painting my Indoor Pool Room/Exercise Room. Here's the problem..?

The problem is that I'm a DYI-er. I dont want to call someone to come paint something I can do myself. My question is :





Everything I've painted my Indoor Pool/Exercise Room, After about 2-3 months I get these grey patches on my all...Sometimes when I place my hand on the wall a few days later the same place i placed my hand turns into this smoke grey patch. You can't really see it directly at once but once you turn the light on or the sun hits my wall you can cleary see all the patches. Could this be mold?Question about painting my Indoor Pool Room/Exercise Room. Here's the problem..?
Have you tried a heavy duty primer underneath your paint? If so, it could be the type of paint you're using. Question about painting my Indoor Pool Room/Exercise Room. Here's the problem..?
Could this be mold?yes it could be do you have a vent the moisture out for the pool if yes check it . and the paint you want to use a high moisture paint or Marine paint to stop the look