Trim the excess paper at the ceiling: Push a 6-inch taping knife into the joint between the wall and ceiling. Using a razor, cut above the knife to trim off the excess. Work slowly. Alternate between cutting and moving the knife. Do not slide the razor and knife together. Continue papering to a point above the door.
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Check the size of the rolls before calculating how much you need. Wallpaper is often priced by the single roll, but can be bought as a continuous double roll. Depending on the size of the pattern's repeat and the width of the rol, a double roll will cover anywhere from 36 to 50 square feet. Many paper companies and retail shops will calculate how much paper you'll need if you provide the square footage of your walls (subtract for windows and doors). Or you can use the wallpaper calculator in the Helpful Info section below.
2. PREMIXED CLEAR WALLPAPER PASTE
Paint that's not mixed correctly can ruin a wallpaper job. So for most papers, it's better to buy premixed products. One gallon is enough for 5 rolls.
3. WALL PRIMER/SIZER
such as R-35 by Roman Adhesives. These products make the wall feel tacky but actually extend the working time of wallpaper paste and make manipulating the paper easier. You'll need 1 gallon per 100 square feet.
4. PAINTER'S TAPE
or masking tape. For holding wallpaper onto switch plates and receptacle covers while the paste dries. One small roll is all you'll need.