How do I get old wallpaper off that has been painted?
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How can I get wallpaper sizing off in order to paint it?
I removed 2 layers of old wallpaper, but streaks of sizing remain on the drywall making it lumpy and it will look awful if I paint it like this.
You will need to score the wallpaper. I use a 50/50 mix of vinegar and hot water in a spray bottle to remove wallpaper. Saturate the wallpaper and let it work. Use a putty knife to scrape off.
Wallpaper scoring tool
https://www.lowes.com/pd/piranha-wallpaper-scoring-tool/3036950?cm_mmc=shp-_-c-_-prd-_-pnt-_-google-_-lia-_-133-_-thinnersandsolvents-_-3036950-_-0&kpid&store_code=2304&k_clickID=go_625682584_34615012510_111134774830_pla-289226792324_c_9021617&gclid=EAIaIQobChMIhYvBvsjX4QIVBtbACh1eVwYhEAQYBSABEgLYy_D_BwE
Peel as much as possible from the walls.
If you can't get to the backing, you may need to score the paper with a tool. Paper Tiger is easy to find. Light pressure because you don't want to damage the wall behind the paper.
Mix 50/50 fabric softener & warm water in a spray bottle or garden sprayer. I've read that vinegar is as effective but I have never used it.
Allow the mixture to sit for 5 - 10 minutes so that it saturates the adhesive on the paper backing.
Scrape with a plastic scraper.
Once it is all removed, wash the walls with warm soapy water (blue Dawn is my go-to) and a microfiber cloth.
If all else fails and it won't come off you can paint over it. I normally don't recommend paint over wallpaper but there are situations that is the only solution. Back in the day there was no "sizing" and people just wallpapered over drywall. That will never come off. Some people don't use 'sizing or primer not knowing they should. If the wrong adhesive was used it also won't come off as there are different adhesives for different types of wallpaper. Some people wallpapered over wallpaper and that is a pain to remove.