Hi, folks. I have a full bath in use by young adults who like to take long showers, and it had some peeling paint a while back. So, I scraped and filled with a filler that supposedly dried to a hard surface with no outgassing. After waiting 2 weeks for that to dry thoroughly, I then repainted during a window when the bath wasn't going to be used for a week, using BM K&B paint. Now, the peeling has returned. How do I get rid of this eyesore permanently? Repeat the process but tell them they can't shut the door for 6 months while they shower? (There is an exhaust fan, and even though it is a good Panasonic with plenty of capacity, it can't keep up with an ultra-hot, long shower.)