6) IF the Old Wallpaper Isable Under The New Wallpaper, The You Either Boub out -quality Product, Or the Wallpaper Isparent. You Need to Replace the Wallpaper. 7) If Interspeed Are Visible in the Wallpaper, The You have Either Poorly Porpared the Surface, Or there Extraneus Particles in the ADHESENT. It is necessary to re -rely the Wallpaper with the Elimination of the ABOVE Defects.