I have removed 15 year old wallpaper out of my mother in law's kitchen. We used a chemical to remove the paper and upon removing the paper we discovered that the wall had not been properly mudded or primed prior to the wallpaper's application leading to the wall being damaged. We repaired the wall and applied drywall mud. Now the issue is when applying wall texture the texture is bubbling and falling off. Any suggestions? I am luckily still my mother in law's favorite daughter in law but that is because I am the only one.