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Can I apply wallpaper over existing wallpaper?

No, you need to remove the original wallpaper and other objects from the wall when pasting new ones, otherwise the new wallpaper will have bubbles, glue opening, hollowing, and other phenomena. Secondly, when applying new wallpaper, first use a scraper to clean the impurities and floating soil on the wall, and then use gypsum powder to smooth out various concave holes. In addition, if the wall is relatively soft, you can first apply a layer of wall base film on it, which can make the wallpaper more firm and not easily fall off.