Why Do Dark Wallpapers Sometimes Show White Seams? And How Decorators Fix It
Dark and richly patterned wallpapers create dramatic, beautiful interiors. However, one concern that occasionally arises during installation is the appearance of light or white seams where the strips meet. While this can initially feel disappointing, especially when investing in premium wallpaper, it is actually a common characteristic of printed wallpaper and not usually a product fault. Understanding why this happens and how decorators address it can help ensure the best possible final result.
Why Wallpaper Edges Can Appear White
Most wallpapers are printed using surface printing techniques. During manufacturing, the ink is applied only to the flat, visible surface of the wallpaper roll. The very edge of the paper remains the natural base colour of the material beneath the ink.
When the wallpaper is cut into strips and installed on the wall, these unprinted edges meet at the seam. With lighter wallpapers this is rarely noticeable. However, with darker colours or bold patterns, the lighter base edge can sometimes show as a fine line between the panels.
This is a normal characteristic of wallpaper production rather than an installation issue or a defect in the product.
Why Seams Can Become More Visible During Installation
Even when wallpaper is hung correctly, seams can shift slightly during the drying process. As wallpaper paste begins to dry, the paper may expand and contract subtly. This movement can occasionally cause the edges to separate by a very small amount, revealing the lighter base paper underneath.
Professional decorators are aware of this and take steps during installation to keep seams tight while the paste cures.
Professional Techniques Used to Reduce Seam Visibility
Experienced decorators use several well established techniques to ensure that darker wallpapers appear as seamless as possible once installed.
1. Colouring the wallpaper edges before hanging
Before each strip is hung, decorators often lightly colour the cut edges of the wallpaper using a chalk pastel, wax crayon, or coloured pencil that closely matches the wallpaper background. This reduces the contrast between the printed surface and the edge of the paper, making seams far less noticeable.
2. Keeping seams tight during installation
As the wallpaper paste begins to dry, decorators will regularly check the joins and gently push the panels together to maintain tight seams. This process helps prevent small gaps from forming between strips.
3. Painting the wall behind the seams
Another helpful method is painting the wall behind the seams in a colour that matches the wallpaper’s background. If a very small gap does appear, the darker paint behind the seam helps conceal it.
4. Final touch ups after installation
Once the wallpaper is fully installed and dry, decorators may use a soft chalk pastel or artist’s pencil to gently shade along the seam. This subtle touch up blends the join visually with the surrounding design.
Achieving a Beautiful Final Result
When these professional techniques are used, the vast majority of wallpaper seams become virtually invisible, even with darker designs. These methods are standard practice in wallpaper installation and are widely recommended by manufacturers and decorators alike.
If you are planning to install a darker wallpaper, it can be helpful to discuss these techniques with your decorator beforehand to ensure the best possible finish.
Final Thoughts
Dark wallpapers are designed to create impact and atmosphere within a space. While the manufacturing process means the edges of wallpaper strips remain the base paper colour, skilled installation techniques allow decorators to minimise seam visibility and achieve a polished, cohesive look.
If you have any questions about wallpaper installation or would like guidance before starting your project, our team is always happy to help.
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