This kitchen wallpaper was stained by a water leak. There was enough left over paper to replace the damaged section. BUT – the paper had been stored in a hot Houston attic since the ’70’s – that’s 35 years! It was far too brittle and fragile to work with.
I found that lightly wetting the back with a damp sponge allowed it to relax enough that I could unroll it. I tried my usual wallpaper paste, but once the sample piece dried, there were stains caused by the paste. See third photo.
Then I tried powdered wheat paste, which is for more delicate materials. This did not stain the paper, but it did cause it to become too wet, crack, split, tear, and created crevices where staining would be likely to occur. See last photo.
I am glad I tested methods and products before I ripped off the old wallpaper. We ended up leaving the old paper on the wall, and I used craft paint to cover the worst of the stains. See previous post. This turned out to be the best solution.