I finished painting a bedroom approx 30 days ago. There was a spot on the wall and when I wiped it off a hole appeared and the paint could be peeled off in one large sheet. The wall had been primed with Glidden primer (water based over latex) and lightly

I have an older home with plaster walls. I painted my bathroom walls and once they dried they were peeling, bubbling and getting extremely deep cracks. So I scraped them and sanded the walls down and put primer on them and I painted again. The same thing happened. Before I