First of all, glue is applied to the middle of a piece of wallpaper and only then spread evenly over the entire surface.
We put the wallpaper after spreading several times. Each fold should be up to 30 cm (for the convenience of gaming). Wallpaper for several minutes should stand for impregnation with glue. And only after that we begin to glue the ceiling, gradually laying out the accordion from the wallpaper. In one hand, hold the folded wallpaper, and the other slowly glue the canvas to the ceiling along the control line. Then everything happens, as when pasting, wallpaper walls: you need to smooth a piece of the canvas in the direction from the middle to the edge. Remove wrinkles and folds. It is advisable to support the wallpaper while they dry. The seams are sure to wipe with a dry clean rag. Make sure that the seams fit tightly to each other.