I’ve heard that one of the reasons you need to repaint your interior is to help keep the drywall from drying out and crumbling. Is this true or just an old wives tale? If it’s true then should you repaint the ceiling at the same time as the walls to

I am in a new house that was built in 2010 so has not been decorated. I started to paint my hall and I keep getting patches appearing on some of the walls. It’s like the paint wont stick. I tried spot remover but that never worked. please help!