The reason for this is based on the principle of adhesion.
Wallpapering over vinyl wallpaper.
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.
The reason for this is based on the principle of adhesion.
We also recommend not wallpapering over a wallpaper that is embossed or embellished as it will create bumps.
The existing wallpaper s material.
Wallpaper adhesives stick best on porous surfaces and coated papers are known to not be absorbent whatsoever.
Vinyl is nonporous so new wallpaper will not stick to it and adding a layer on top of it will create mold.
You must remove it before putting new wallpaper up.
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Stripping old wallpaper is a time consuming task you.
How to hang new wallpaper over old wallpaper.
Unfortunately wallpapering over vinyl wallpaper is not an option.
Wallpaper adhesives stick best on porous surfaces and coated papers have zero porosity.
The only wallpaper that is nearly guaranteed not to cause you residual problems if you leave it on the walls is non coated wallpapers.
You must make every effort to remove vinyl coated wallpaper first.
You should make every effort to remove the vinyl wallpaper first before trying to cover anything.