At some point, the very edges of the wallpaper started curling back at the seams. This is more pronounced at the upper portions of the wall than at the chair rail. Meaning, humidity from showering is rising into the air, collecting under the ceiling, and working its way into the seams.
Once humidity gets into the backing of the wallpaper, it can cause the backing to expand. When that happens, the paper has to go somewhere. So it pushes itself away from the wall. Hence the curling that you see here.
What’s odd to me is that this happened with a paper that’s on a non-woven backing. Non-wovens are 20% polyester, so pretty resistant to moisture and humidity. I’m guessing that this company used less than the industry standard of 20% polyester. The material was super thin and flexible, which is unlike most non-wovens I’ve worked with.
Then I used my heat gun – set on Low – to gently warm up the vinyl surface of the wallpaper . The heat gun served several purposes … It helped speed the drying of the paste , so it got tacky and held more quickly and firmly. The heat gun also ” melted ” the vinyl surface a wee bit, so it would curl back in the opposite direction.
I used a 3″ stiff metal putty knife to push the two edges of wallpaper back down to the wall. The metal knife heated up, too, and helped to get the vinyl to conform.
Using the heat gun and the metal putty knife also helped the two edges from the two strips to meet up together … sort of like two mountain big horn sheep butting their heads together . Butted together this way is better than one lying on top of the other.
I was really pleased with how well this worked. Sorry – no pics!
The Wallpaper Lady's Blog 