The existing wallpaper s material.
Wallpapering over vinyl wallpaper.
You must remove it before putting new wallpaper up.
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The reason for this is based on the principle of adhesion.
You should make every effort to remove the vinyl wallpaper first before trying to cover anything.
You must make every effort to remove vinyl coated wallpaper first.
Wallpaper adhesives stick best on porous surfaces and coated papers have zero porosity.
Unfortunately wallpapering over vinyl wallpaper is not an option.
When moving into an older home finding remnants of previous occupants wallpaper isn t uncommon.
How to hang new wallpaper over old wallpaper.
We also recommend not wallpapering over a wallpaper that is embossed or embellished as it will create bumps.
In this video i demonstrate how to hang wallpaper over existing wallpaper.
Otherwise perform the same steps as if you were painting over your wallpaper.
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.
The reason for this is based on the principle of adhesion.