ᐅ Removing fiberglass wallpaper – What are the next steps?

Dear readers,

We have removed fiberglass wallpaper from the walls in two rooms. In one room, the wallpaper came off relatively well, but in the other room, it was a bit more difficult (see pictures). Later, we plan to hang new wallpaper on these walls (approximately like the one shown in the picture, "Novaboss").

Question regarding the "good" wall: Do all small residues need to be completely removed before applying the new wallpaper? There are a few minor damages here and there that still need to be repaired. I tried to remove the small residues with a sander — it works somewhat, but takes a very long time. Are there other ways to remove these residues?

Question regarding the "bad" wall: The wallpaper was more strongly glued to the wall here, so a lot of plaster came off with it. What is the best way to proceed in this case? Is it enough to remove the yellow residues with a scraper and then roughly skim coat over it?

Additional question: We still have more fiberglass wallpaper in another room. Should we just leave it on and wallpaper over it? I’m unsure whether it will come off easily or not.

I hope I was able to ask reasonably clear questions despite my amateur knowledge and look forward to your answers!

Best regards

Hello,
regarding the topic of wallpapering over existing wallpaper, I can only say: don’t do it.
We recently renovated a house, and in some areas the wallpaper had been applied over the old wallpaper. It peeled off terribly and took forever to remove. Sure, it might seem quicker at first, but eventually you’ll want to redecorate again, and then you’ll regret not removing the old wallpaper beforehand.
You should make sure the surface is clean and free of damage, dents, and so on, because all of that will show through the new wallpaper later, even if its texture might seem to hide some imperfections.

Hello X_SH5_X,

Thank you very much for your quick message.

Regarding leaving the wallpaper on: That was exactly my thought as well. Invest a bit of effort now, and the result will be a clean job.

Do you have any other ideas or suggestions on how to remove the remaining bits? Just roughly sand them off since the wall will be replastered anyway?
I have since figured out and read up on how to better remove fiberglass wallpaper, if needed.

Scraping off the wallpaper was a tedious job. Soaking it well helps, but it still remains an annoying, time-consuming task.
We then sanded the walls as you suggested. We borrowed a large sander from a friend and used a small detail sander for the corners and edges.