On a measured piece of wallpaper, the glue should be applied from the middle to the edges. A segment of the wallpaper smeared with glue is folded in half and left for several minutes so that the glue has time to absorb. It is also necessary to smear the surface of the wall with glue. Wallpaper glued to the wall starting from the upper part. Stuck wallpapers must be rolled with a soft roller or even a simple piece of fabric in order to drive out air from under them. Squeeze the wallpaper from the middle to the edges.