Brown/red Stains On Ceiling After Painting - Painting - DIY Chatroom Home Improvement Forum

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Old 05-16-2014, 02:51 PM   #1
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Brown/red stains on ceiling after painting

I have these brown or reddish color stains that showed up after painting my ceiling. There are no smokers in the house so I'm not sure where they came from. This has happened to me before and the only thing that covered them up was oil based Kilz. The below pictures are using a latex primer stainblocker. What the heck could this be from??
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Brown/red stains on ceiling after painting-dscn1306.jpg   Brown/red stains on ceiling after painting-dscn1303.jpg  


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Old 05-16-2014, 03:45 PM   #2
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What kind of ceiling is this? It almost looks like some sort of metal ceiling and the latex primer allowed rusty metal to wick through into the finish coats.

If it's plaster or drywall it could be just about anything that maybe was splattered onto the ceiling and with the latex paint, it again is something that telegraphed through the paint. That ceiling looks like it has a lot of crap/boogers on it so who knows for sure.

When in doubt prime with an oil based or at least a shellac based primer that will once and for all seal up those type of stains. Coverstain from Zinsser is good stuff for that.


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Old 05-16-2014, 03:45 PM   #3
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Could be mold. Could be chemicals from the materials used to build, paint, etc. leaching through due to high moisture. Could be ??? Ron
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Old 05-16-2014, 03:54 PM   #4
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Looks to me like rust and that would explain latex making it worse and oil covering it.
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