1. First of all, let's take a closer look at what the primer film is and why it's important. Among the essential tools for wallpaper installation are adhesive, rubber powder, and the primer film. The primer film is a transparent, odorless, and eco-friendly material that, once applied and dried on the wall, forms a hard, protective layer. Its main purpose is to create a barrier between the wall surface and the wallpaper, preventing direct contact. This acts as a protective shield, ensuring the wallpaper stays in place and lasts longer.
2. Now, you might wonder why we need to apply this primer film. Most walls where wallpaper is installed are either cement-based or painted. These surfaces can sometimes be alkaline or contain pollutants—chemical substances that can react with the paper-based wallpaper over time. Experienced installers know that if you stick the wallpaper directly onto the wall without protection, after about a year or so, it may start to yellow or even peel off. That’s why using a primer film is crucial—it protects the wallpaper from these harmful elements and extends its lifespan significantly.
3. To clarify further: some people ask if they can use Nippon paint, milk paint, or other types of wall coatings for wallpapering. The answer is yes, you can apply wallpaper on these surfaces. But the question remains—do you still need to apply the primer film? The answer is absolutely yes. Even though these paints are often considered environmentally friendly, they are still chemical-based products. Painted walls tend to be smooth and may contain alkaline substances that can weaken the bond between the wallpaper and the wall over time. Without the primer, the wallpaper might start peeling off within two years or even turn yellow. It's a small investment—just one bottle of primer can cover more than 20 square meters at a low cost, and it provides a much stronger, more durable base than the paint itself.
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