What to do about stained Victorian wallpaper?
We have a 1904 Victorian with lathe and plaster walls. As is typical in these homes, many of the ceilings are wallpapered with a sturdy wallpaper (name escapes me). We have been told by multiple people in the area historic home society, as well as realtors, that the wallpaper covers up the inevitable cracks in the plaster and in no situation should be taken down because it "keeps everything together".
As you can see, there are some old water stains (no current moisture issues) on some of the wallpaper:
We've been told that this will be easily fixed with some Kilz or stainblocker. Does this sound about right?
In other rooms, the wallpaper wasn't hung as well and the seams show and are coming apart in places, and the wallpaper glue has caused yellowing in places. The inspector for our house also encouraged to leave this up and said that if it bothered us, we could consider 1/8" drywall ceilings. Any advice on this? Or in the meantime, is there a way to "glue" down the seams before covering up the yellowing with Kilz or stainblocker?