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Step 1
Take a good look along the top of your walls. Clean the walls with a mild ammonia cleaner to remove soap and spray residue. If there are any cracks, even hairline ones, caulk them. Scrape off paint drips and bumps because wallpaper border is quite thin and imperfections will show through.
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Step 2
Although wallpaper border generally comes pre-pasted, it may not hold up well in a bathroom's high humidity. In addition, I recommend using thinned-down wallpaper paste as a backup. Mix it to the consistency of thick paint, and apply it to the wall before you hang each section of border. Then wipe all the excess off.
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Step 3
The trickiest part of hanging wallpaper border is getting the pattern to match up, and sometimes it's impossible. Start in the least obvious corner. Usually, this is the corner above the door, people don't pay much attention to it.
















