There are many reasons for this situation, including construction reasons and material reasons. In our century, the workers who decorate our walls in Hongda will first remove the original wall skin and brush the interface agent after leveling (which can prevent the harmful gas from evaporating and better bond the putty with the wall). If you were looking for a decoration company to install it at that time, you can call customer service to let them solve it. I suggest that you make all the top surfaces, because the places that need to be repaired are too big, and its beauty is difficult to control! ! ! I hope I can help you!