Wallpaper liner is notoriously difficult to remove from drywall. It often rips the paper surface of the drywall, causing damage that must be repaired. This process is not difficult, but it is labor intensive and can get messy. If the damage to the wall is extensive, consider replacing the drywall entirely. This may seem drastic, but in some cases, it is actually the quickest and cheapest option.
Preparation
If you have decided to repair your current drywall, preparation is key. First, put down drop cloths and tarps. There will be a lot of debris and joint compound dust, so this will help with the eventual cleanup. Second, buy a utility knife and some high-quality drywall knives. A 6-inch and a 12-inch knife will do for most situations. These will also be used for scraping, so make sure the handles are comfortable. Finally, buy ready-mixed joint compound. Although quick-setting joint compound dries more quickly, it is far more difficult to sand and work with.
Remove Loose Material
The removal of wallpaper liner often tears the paper surface of the drywall. This roughened surface will peel endlessly, especially if it is wet. The loose paper cannot simply be covered with joint compound, because the surface will bubble.
Try to remove the loose pieces, using your drywall knives to scrape and your utility knife to cut. Avoid peeling the paper surface further, if you can. Your goal is just to remove loose pieces.
In many cases, you will need to take further steps to remove the loose pieces, as each time you scrape you will loosen more and more paper. One technique you can try is to use a piece of 100-grit sandpaper to gently sand the rough paper surface. Move your hand in a circular fashion. This will twist the bits of paper off, instead of just peeling them.
As a last resort, some professionals cover the roughened paper with a coat of oil-based paint or a special drywall sealer (available in most hardware stores). This causes the paper bits to re-adhere to the wall. Be cautious when using oil-based paints in an area with poor ventilation. The fumes can be dangerous.
Repairing the Surface
Once you have removed as much of the loose paper as possible, coat the wall surface with joint compound. Use your 12-inch drywall knife to cover the rough surface with a thick coat of ready-mixed joint compound. After it has dried, examine the surface for bubbles. These bubbles must be cut out with a utility knife, or they will show through paint. After they have been cut out, recoat the surface. Repeat this process as necessary until all bubbles have disappeared.
Finally, sand the treated surfaces with 100-grit sandpaper. Follow up with another coat of joint compound if the surface is still rough or pitted. Allow it to dry. Repeat the process as necessary until the wall is smooth and ready for paint.
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