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Old 08-15-2012, 06:10 PM   #1
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Skim Coat over Knock-down previously covered by Wallpaper


I am working on a bathroom that originally had knock-down that the previous owners wallpapered over. I removed the wall paper to expose the original knock-down and did my best to remove the glue.

I primed the walls and have been skim coating followed by sanding to fill in the knock-down. After several coats of mud, I primed the walls again, skim coated, and sanded again.

It has been 4-5 skim coats of mud and I haven't been able to fill in all the knock-down. I have been using premixed joint topping compound, sanding with 220 grit, and priming with Kilz.

The hardware store suggested that I prime between each skim coat. I think the premixed joint topping compound is shrinking while drying exposing the knockdown.

Any tips or suggestions or do I just need to keep going?

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Old 08-15-2012, 09:27 PM   #2
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Skim Coat over Knock-down previously covered by Wallpaper


You don't need to prime between skim coats.
Are you using the all purpose compound? If your using the light compound that could be part of the problem. But five skim coats should be plenty to cover the knockdown texture. Be sure not to sand all of the mud off between coats.

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Old 08-16-2012, 08:53 AM   #3
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Skim Coat over Knock-down previously covered by Wallpaper


I am using light compound and haven't been sanding extensively. Would using a sponge instead of sanding been better? What about using a roller and thinning the compound to apply it?
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Old 08-16-2012, 12:31 PM   #4
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Skim Coat over Knock-down previously covered by Wallpaper


Quote:
Originally Posted by jsmoe View Post
I am using light compound and haven't been sanding extensively. Would using a sponge instead of sanding been better? What about using a roller and thinning the compound to apply it?
You need to use the All Purpose joint compound. Not the light.
I think using a sponge to sand between coats will help too.
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Old 08-29-2012, 04:28 PM   #5
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Skim Coat over Knock-down previously covered by Wallpaper


Agree. Topping compound is very lightweight, scratches very easily, doesn't fill voids well, and (in my opinion) is totally a waste of time if you want a quality finish. I have used it on one or two occasions in years past where the contractor put it on the job. Have never bought any.....
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