Hello, the former owner painted the plasterboard wall with apricot paint - unfortunately I do not know if penetration was used and what type of paint it was. I overcoated the paint 3 times with white, but with the last coat the original paint and the new one stuck to the roller. So take everything off except the plasterboard. Based on the advice from OBI, I penetrated the whole thing, sealed the places that were damaged. I sanded the putty, painted it with the first coat - paint, but it's still spotty. You can see light spots - where there is putty, and then darker places where there is no putty. During the next coat, I noticed that it was starting to peel off again. do you have any experience with this please? What's next ? I can't change the plasterboard. Did I think of sticking wallpaper on that? But I don't really want that ... Thank you