One, Why does wallpaper have black lines?
1、This could be due to cracks in the wall, which are unrelated to the wallpaper. once the wall has cracks or hasn't been properly prepared, or if the wall surface is damp, wallpapering can easily lead to black marks.
2. This may be due to the use of poor-quality adhesive for wallpaper application, or the application of the material too thickly, which has not fully dried. This can result in black spots.
3. Black marks appearing on the wallpaper may indicate a quality issue with the wallpaper itself. Some individuals choose wallpapers that are of poor quality, which can result in the appearance of strip-like black marks during installation.
Two. What should be done if there are black marks after applying wallpaper?
1、If the wall has cracks, it is essential to treat the wall before applying wallpaper. The wall surface should be clean and free of dust, pits, or cracks. Applying a coat of white primer is necessary. If the wall issue is discovered after the wallpaper is applied, the solution depends on the situation. One option is to leave the black marks as is, or to remove and reapply the wallpaper. Reapplication is more complex and depends on individual needs.
2. If the adhesive used is unsuitable, it is necessary to choose a high-quality wallpaper adhesive to prevent the occurrence of black spots during wallpaper application. If the problem is detected early, try to contact the seller for compensation. The solution is the same as above.
3. If the issue lies with the wallpaper itself, you can directly contact the seller to request repair or replacement. Generally, if the problem originates from the wallpaper, you can request compensation.