Before applying any type of paint over wallpaper, it's vital to ensure that it's well adhered to the wall. Assess its condition by running a drywall knife lightly over the entire wall. Any spot that you can easily work out or press in with the knife is a problem area, and the paper in that area either has to be glued to the wall or cut off with a utility knife. Dig the corner of the knife into small bubbles to puncture them, then scrape off the loose paper. If the paper comes off with little effort, and small voids quickly turn into large ones, you should reconsider your decision to paint over the wallpaper.
Before painting, make sure the wall is clean and mildew-free. Gently wash away dirt and grime with warm, soapy water. Wash off any mildew with a solution of 1/2 cup chlorine bleach per gallon of water. Dry the wallpaper with a soft cloth. Wait until the wallpaper has dried completely before adding primer.
You need to seal the wallpaper seams to keep the moisture in the products you spread on the wall from seeping behind the paper and loosening the glue. Do this with a shellac-based, stain-blocking primer. Paint the primer along the seams with a paintbrush, then cut in the edges of the wall and roll the primer over the entire wall with a medium nap roller.
If the wallpaper appears rough or damaged after priming, you may want skim coat it with drywall joint compound to hide the wallpaper seams, as well as all the bubbles you repaired. Cover the floors and furniture with plastic sheeting, as this can be a messy procedure. Premixed mud has just the right consistency for this job.
You're now ready to paint -- and at this point -- you can paint the wall just like any other by brushing and rolling two coats of latex-based wall paint over it. Use a synthetic-bristle brush to cut in around the edges of the wall and around trim, and then immediately roll the wall while the cut-in paint is still wet using a medium-nap roller.
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