Avoiding Overlapping Seams Properly aligning seams is key to a flawless wallpaper installation. Paste-the-wall wallpaper should be applied edge-to-edge rather than overlapped, as overlapping can cause visible ridges and an uneven appearance. Carefully butt the edges together, ensuring no gaps or overlaps. Unlike paste-the-paper wallpaper, which can expand when wet, paste-the-wall wal... https://www.arthouse.com/blogs/how-to/a-step-by-step-guide-of-how-to-hang-paste-the-wall-wallpaper