4 years ago my husband repainted our bathroom ceiling. He found that primer was not adhering and the paint was flaking off like chalk when he touched it (the old paint, not the primer). Someone from the local paint store said it was probably what he referred to as "chalk paint" and that it would all need to be scraped and washed before we could repaint. He wore a mask and glasses and the whole bathroom was covered with this chaulky substance by the time he was done, but he cleaned it all up, primed and painted. Within a year the paint started to peel. We do have an exhaust fan that was installed that same year and we use it. I'm wondering if it's still this old crappy "chaulk paint" coming back to haunt us. Any recommendations for making sure it works when we repaint this time?