Pillow the finished surface. This is required so that glue for wallpaper is not too quickly absorbed into the putty. In addition, the primer guarantees the optimal fastening of wallpaper with the wall and prevents the occurrence of the fungus. Pay attention to the fact that the walls need to be primed at least twice. The most important condition for the optimal result of this process is the uniform application of the primer. That is why it is recommended to use a high -quality wide brush.