Some wallpaper installers insist in using a wall covering liner because of the fact, "Wallpaper does not stick to the wall, it sticks to the paint on the wall."
But there is also another problem that could occur. If you use a plain latex primer on the drywall as a base the wetness from the paste can leak through and wreak havoc with the paper coating on the sheet rock. An acrylic prep coat will prevent this and should be used before putting on any wall covering. This will ensure that you can get the wallpaper off if you ever decide to replace in years to come.
if you are planning to put up expensive flock wallpaper or grass wall covering the first step is to hang a wall covering lining. This comes in rolls like wall paper and acts as a primer or holding agent for the wall covering. It also should be put up on walls which have been previously painted with gloss or oil-based paint otherwise the covering may begin to separate from the wall after a time.
Since the wallpaper goes on vertically the pros recommend hanging the liner horizontally so that the seams don not match up. It also adds a laminating effect like plywood for a better hold. It will cover a lot of blemishes but any obvious ones should be filled, sanded and painted with the prep primer.
Also, get some practice before you wreck a roll of expensive paper. Buy a cheap, ugly covering from bargain bin and put it up in the basement or some area where it won't be seen. If your still having problems it would be best to call a qualified installer.
Because any mistakes on your feature wall will drive you crazy every time you lay eyes on it!
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