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Margret
Advice about wall patch
Margret

Hi,

When prepping for painting the stairwell in my 1924 house, two cracks were fixed using fiberglass self-adhesive tape and joint compound. The compound was left to dry between applications and before painting. It's been about a month since the painting was completed and I'm now seeing that the patched areas are darker than the wall. The patches are under a window on an exterior wall. Any thoughts as to why this has happened and how I can fix? Photo attached.

Thank you!

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Clarence
Re: Advice about wall patch
Clarence

 If your walls are Plaster & joint Compound was used over the Plaster it is a moisture problem. Joint Compound is a clay product & is affected by moisture.

Margret
Re: Advice about wall patch
Margret

Thanks Clarence. Any suggestions how to fix? Every online reference we checked, including from This Old House, used joint compound on plaster.

Clarence
Re: Advice about wall patch
Clarence

 The problem is just that everyone states it is OK to use Joint Compound over Plaster. In  my opinion after working in the Plaster trade for over 41 years it is the worst thing that can be applyed over plaster. As for your fix you could try a good sealer type primer on the effected wall than repaint this may help? Your real problem is moisture behind the wall area. You may have a small water leak at the window?

Margret
Re: Advice about wall patch
Margret

Will try the sealer. Thank you, again! If you ever want to do some plaster work in NC... :)

Clarence
Re: Advice about wall patch
Clarence

 I am retired from the Plaster work but do keep up with alot of plaster workers. If you would like i can find a good Plasterer in NC. if you need one?

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