Mudded on top of newly painted/primed surface, now it's all peeling in sheets!


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Old 09-13-14, 09:08 AM
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Exclamation Mudded on top of newly painted/primed surface, now it's all peeling in sheets!

Oh boy, the party continues

So I have a section of repaired/replaced wall joining an existing section. The new section and the transition had joint compound on them. I used Sherwin Williams drywall primer on all the new stuff and also feathered it into the existing areas just to make sure the transitional mud areas were fully covered. Prior to priming I wiped everything down with a damp sponge. It's a pretty small area (less than 10 sq ft) so I'm sure I wiped it all. I didn't do multiple wipings or any vacuuming, just a single pass with a damp sponge.

24 hours after the SW drywall primer was applied we painted with the SW "SuperPaint" which was a flat color (if that matters). Then about 12 hours after that we noticed a section of joint compound that needed to be feathered more. I know it's not ideal to figure this out now but it honestly didn't appear until the flat paint was applied. We even had the primer tinted hoping that would show any imperfections that needed touch-up before moving on. With the primer it looked great but with the paint it really jumped out.

Anyway, I started applying a layer of all purpose joint compound and about a minute later as I was working it I start getting a complete peel of the mud+paint+primer when I scraped the knife along the wall to feather the mud. Under the peel it's down to bare joint compound and the original paint. The crazy thing is that the peeling stops dead at the point where the new drywall mud was being applied today. This makes me think it wasn't a poor bond between the primer and underlying surface until the new mud on top of it all somehow loosened it. Perhaps just from the moisture? Or perhaps some kind of reaction between products?

So, my question is, did the primer and paint just need to cure longer? I did a little sanding prior to applying this new mud and I couldn't believe how hard and resilient the new paint seemed to be. I was barely getting any to come off on the sanding pad. That made me think it was fully dry and ready for the mud. Or am I barking up the wrong tree and there's actually something else that I did wrong here?

Any advice is greatly appreciated. This is my first time doing drywall, mud, priming or painting. It's a lot to learn all at once!

Thanks,
Jeff

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Old 09-13-14, 09:34 AM
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It can take latex coatings a week or more to cure. Raw drywall will pull some of the moisture out of the coatings where previously painted areas will not. Why type of paint was originally on the wall?
 
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Old 09-14-14, 09:58 AM
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Originally it was an "aqua borne ceramic" paint in the same flat latte color... the pro painters that built the house did that so I don't have too many more details on it.
 
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Old 09-14-14, 10:08 AM
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I've never used any 'ceramic' paint. What I've ever read about it makes me very skeptical as they claim it has insulation properties. I suspect not enough curing time is the problem but to play it safe, I'd probably use a solvent based primer over the builder's paint - just to play it safe.
 
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Old 09-14-14, 10:20 AM
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The original paint has been on for 7 years, so hopefully it is cured at this point I can't speak to the workability aspects of it, but from the perspective of a homeowner it sure is durable paint. You can scrub the heck out of it and the paint doesn't mark or change color. Even with a sanding pad I feel like I'm barely cutting through it.
 
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Old 09-14-14, 02:52 PM
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Just to be clear - I was referring to the curing time of the coatings you just applied.
 
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Old 09-14-14, 07:18 PM
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Oh, ok, I understand now. Thanks again for the help!
 
 

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