Will skim coating remove cardboard on walls?
I just removed wallpaper from a room and there’s cardboard underneath it. It’s not just a thin layer, it’s like wallboard. Will skim coating it stick to it well enough??
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It's the drywall has paper/cardboard on both sides of it & gypsum/plaster like material inside- yes it will stick here's bunch of videos on how to skim coat https://www.youtube.com/results?search_query=DIY+skim+coating+drywall if the drywall/paper has been ripped it'll need fixed before you skim coat look at videos
I don't know if Lynn's videos show it, but you need to seal the paper first. Use a utility knife or Exacto knife with a sharp blade to clean up any fuzzy edges on the torn paper. Then use a sealer/bonding agent. if you try to apply joint compound directly to the area, it will suck out all the moisture and will not cure well.
If it’s thick cardboard, you may have “Button-board” or a Masonite product used in mobile homes, porch enclosures and other light construction- all of which will bleed brown residue into the skim coating.
So you’ll need to put a stain barrier primer, like Kilz or Zinzer on the cardboard or on the skimcoat- so that your finish coat will not have the brown bleed through.