I moved into a 1945 Cape Cod. In the entry, living room, and stairwell to the second floor was wallpaper. We scored the whole thing, then put on the gel. It would not come off. We tried vinegar. Nothing. Hot water. Nothing. We rented a steamer. Tried different scrapers. It took 3 people an entire day and some serious hand pain to remove ONE wall. A small wall. They must have used superglue to put it up. We didn't have the time or energy to face the impossible job in the rest of the area, so we painted over it in desperation. I know: sacrilege. Of course, we can see the score marks through the paint. I don't think removal is an option. It was a fool's errand before we painted over it. Can I skim coat over this? Any other suggestions (other than papering over it) for how to hide the score marks? They are on every square inch. Thanks.