Handling Sloped Ceilings and Uneven Walls If you’re applying paste-the-wall wallpaper to a sloped ceiling or an uneven surface, extra care is needed to maintain alignment. Measure each strip individually to accommodate the slant, and always start from a straight reference point to avoid crooked wallpaper. Unlike paste-the-paper wallpaper, which can warp when wet, paste-the-wall wallp... https://www.arthouse.com/blogs/how-to/a-step-by-step-guide-of-how-to-hang-paste-the-wall-wallpaper