Cracking paint in bathroom
I'm redoing mv bathroom. It looked like this when we bought the house and I assumed the previous owners had painted over wallpaper because this cracking is only happening on the top half of the wall. And it stops in the same spot all around the room. It's an old house and the other bathrooms have tile halfway up the walls so I just assumed they renovated and just didnt take the wallpaper down (my kitchen cracked like this and it did have wallpaper under the paint). However now that I'm starting to tackle it, I don't think it's wallpaper but iust a moisture issue, or an issue that came up when thev painted. Mv question is how do I fix this and how do I prevent it from happening again? Do I need to sand all the original paint off? Could I leave the bottom half alone since its not cracking?