
So you cut this strip 1/2″-1″ wider than the gap. That means that it’s going to wrap 1/2″ or so around that corner. So you’ll have to trim off the excess. In this way, you’ll be able to get a custom fit into that corner.
But, you’ll also get paste slopped onto that strip on the left. Some papers you can wipe the paste off easily. But others are more delicate and can be damaged or stained . Why take a chance?


This blue tape is pretty useful. It’s also helpful when double-cutting ( splicing ). Another great feature of this blue tape is that it snaps apart quite easily, so you don’t need a scissors or blade to cut your pieces. It’s imported from Japan. (Those guys have a lot of cool wallpaper tools.)
It can be purchased here https://www.wallpapertoolstore.com/product/blue-cut-tape/
Some people use waxed paper cut into strips, or yellow caution tape, or painter’s plastic cut into strips. But nothing parallels the usefulness and quality of this blue cut tape .