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Scrape off any elevated spots on the wall (Image 1). Use a cloth to wipe off any debris.
Dip the paper into the water tray.
Hang the paper in place (Image 2), using a plumb line to ensure that it's straight.
Use a soft brush to eliminate any air bubbles under the paper and to make sure the paper is tight in corners.
Use a small seam roller to press out the seams between sheets of wallpaper.