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No, you don’t always have to remove old wallpaper before applying a new layer. However, you should pull off the existing wallpaper if it’s cracked, peeling, or in poor condition. We’d also recommend against putting wallpaper over textured or dark-colored wallpaper because the old layer may be visible through the new one. In addition, if you try to hang new wallpaper over vinyl-coated wallpaper, the adhesive might not stick properly. 

While it is possible to paint over wallpaper, it’s not always ideal. If the wallpaper is firmly adhered, has no bubbling or peeling, and isn’t textured, you can try to prime and paint over it. Use an oil-based primer to prevent the adhesive from bleeding through. However, if the paper is damaged or loose, removal is the better long-term solution.

Hiring a professional wallpaper hanger is usually a worthwhile idea because, while the application of wallpaper itself is easy, getting the finished product to look good is complicated and takes a lot of practice and patience. A professional wallpaper hanger will not only be able to hang your wallpaper seamlessly, but they will also get an even application of wallpaper paste to avoid bubbling and imperfections immediately and over time. Plus, they can provide their professional opinion on whether to remove or wallpaper over an existing layer of wallpaper.

You can put wallpaper in a bathroom, whether over paneled walls or drywall, but it's important to choose the right type of wallpaper. Bathrooms tend to be humid environments, so you want to pick paper that's water-resistant, such as a vinyl wallpaper. Proper wall prep is also critical, so that the paper clings to the walls, even after several steamy showers.