Test the bond strength of a surface (door wallpaper)

Since we don't know all surfaces (e.g. smoothly lacquered vs. wooden surface) and the adhesive strength depends very much on the surface, the adhesive strength always turns out differently. Please note tip 2 from the door wallpaper instructions: this makes it easier to apply on very strongly adhering surfaces. We always recommend carrying out a test beforehand with a leftover piece from the unused border.