How to prepare these walls for painting?


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Old 09-17-22, 08:55 AM
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How to prepare these walls for painting?

We have a bathroom remediation project: the walls had been papered with a highly textured wallpaper that attracted dirt. The wallpaper has been removed and we're left with outer surfaces of sheetrock half pulled off, leaving that highly fibrous "torn paper bag" surface. In photo 2 at the ceiling above the towel bar, the lighter blotchy area, i'm told, is wall paper glue. Below the towel bar is a plastery surface that looks like it has been skimmed.

What are the steps for painting? I know we need to get to a smooth surface but I'm not quite sure how, or what steps, or if we have workable shortcuts. For instance once we get to smooth, prime with Kilz or similar for mold prevention? If we need to apply a skim coat, do we prime before the skim coat, or both before and after?

A clue for the clueless, please- thanks for your help!




 
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Old 09-17-22, 09:16 AM
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You need to apply either Zinnser's Gardz or an oil base primer over the torn drywall. That will prevent the water in latex paint or joint compound from softening the gypsum and/or making the remaining paper bubble. After the drywall work is done it doesn't matter what type of primer you use.
 
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Old 09-17-22, 10:52 AM
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Probably easier to install new gyprock or green board.

Best to rip the old stuff out cutting it at the center of the studs if possible.
 
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Old 09-18-22, 06:57 AM
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Thanks for your replies!
 
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Old 09-18-22, 12:29 PM
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Skim coats.
 
 

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