Step 2: Apply the paste to the wall
The initial strip must be hung vertically for a proper wallpaper application. Mark the width of the strip with a pencil, then use a level to draw a vertical line on the wall that slopes downward. This will be a helpful reference when it comes time to hang the first strip.
Using a roller or brush, apply the wallpaper paste directly to the wall, covering the first marked section by a few inches with a smooth and even application. To avoid blisters, you must have a uniform, soft coat. Adhesive-backed peel-and-stick paper is not required to adhere.