Painting must be done right otherwise this is the result. A good paint job involves a lot of preparation and quality materials. Often people paint over others' bad work and that just postpones the inevitable. I believe in doing things right. When I paint and the original paint looks like it's failing, I insist on stripping it to bare wood. Then I can prime and paint the way it should be done.
A new two-in-one prime/paint product seems like a good idea but the nice people at Cloverdale Paint think otherwise. Please ask for the writeup they have about this topic. It's very interesting reading.
The photo at top shows how paint will peel off unprimed plaster. In order to repair the plaster correctly, the new plaster must have a good base to stick to. This paint obviously isn't adhering so any plaster applied on top would not stick well and the area could crack again.
