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Old 12-24-2011, 11:42 AM   #1
jadnashua
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Kerdi and drywall mud

Ideally, your shower area is virgin drywall. But, what do you do if the builders mudded the whole area? Schluter says prime it with a laytex primer, but doesn't give any recommendations. What should one use that has been tested and reliable? The danger of going directly over the mud is it could soften and you might end up with a debonded area. personally, I don't think it would be a big deal as it would reharden, and probably then never get wet again, but the what if scenario could come into play, especially if a large area was skimmed out with the non-hardening stuff.
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Old 12-24-2011, 12:10 PM   #2
jgleason
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I would use the latex-based Kilz on the joint compound, wait a day and then install the Kerdi.
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Old 12-24-2011, 02:29 PM   #3
doitright
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Hi Jim

Zinsser also has some great primers. You can pick one from here.
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Old 12-24-2011, 02:30 PM   #4
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I like the Zinsser oil based that dries in one hour and can be latex'ed over great stuff
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Old 12-24-2011, 02:55 PM   #5
eurob
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Jim,

Thinset mfgs will recommend you the right primer to apply on the drywall mud , prior to the thinset.

As an example , Mapei recommends Primer L --- 1 part primer and 3 parts water ratio --- to be applied over gypsum products . Planicrete AC --- 1 part AC and 1 part water ratio --- if I remember correctly , is also recommended .

Give them a call , I am pretty sure they have a primer for your application .



P.S. We don't recommend the tiled areas to be drywall mudded , but who listens to us .
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