Wall preparation
Condition of the surface to be wallpapered
Before starting, check that your wall is clean, dry, free of mold and without cracks or rough edges. The wallpaper is not completely opaque. It is preferable that the color of the wall to be wallpapered is light so as not to alter the colors of the wallpaper.
If you have a surface with cracks and/or holes, you will need to coat them beforehand and wait until the coating is completely dry.
If your wall is painted, sand with sandpaper (medium to fine grain) for better glue adhesion. If the wall has never been painted, you can apply a white primer. Finally, clean the wall surface using a damp sponge or cloth to remove any traces of dust or plaster. Let it dry before moving on to the next step.