The only wallpaper that is nearly guaranteed not to cause you residual problems if you leave it on the walls is non coated wallpapers.
Can i paper over vinyl wallpaper.
Homeowners can tell if it is a true paper by using a sponge.
There are two types of wallpaper.
Vinyl is nonporous so new wallpaper will not stick to it and adding a layer on top of it will create mold.
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True paper papers are generally high end products or are made overseas.
If the existing wallpaper is firmly adhered to the walls and has a smooth texture free from any embossing raised embellishments or flocking you can add a fresh layer of wallpaper over the old.
However vinyl coated paper cannot be wallpapered over.
Wallpaper without vinyl coating is the only wallpaper that can guarantee success.
A safe way to determine if your new wallpaper can be applied over the old paper is to see if you can tell what kind of wallpaper is currently on the wall.
Ease up these pieces of vinyl with a wallpaper scoring tool to allow the wallpaper remover to get beneath the vinyl and to the adhesive.