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 White stains months after painting

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PaintPals
post Jan 21 2021, 01:10 AM

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QUOTE(cloudlionheart @ Jan 20 2021, 07:12 PM)
Paid painters to repaint my room about a year ago, after a few months the white 'stains' started appearing.

I wasn't home and my parents were kind of overseeing the job, but they can't confirm if the painters actually primed the walls. They did tell me that the painters had to do a lot of coats, about 5-6 coats to get the colors on the wall. After scraping it a bit, the previous color is underneath the new paint so I think they painted over them.

It's all over my room and I can't seem to get rid of them through normal means.

Paint used is Dulux Pentalite

Does anyone know what is the cause and solution?

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This is paint formulation issue. Should contact paint manufacturer/painter to solve the problem for you. Wipe the wall first in one area and change water to wipe on another new area and see if the problem keep coming back.

This is normally caused by excessive extender/thickener used.
PaintPals
post Jan 22 2021, 11:43 PM

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QUOTE(e-lite @ Jan 22 2021, 11:27 PM)
Doesn't Nippon 5100 and 5400 have calcium carbonate also? If yes, won't this be a repeat of same problem? Alkyd primer would be like those oil based primer
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Calcium carbonate is commonly used as extender in paint. It's just that formulation problem that incorrect formulations can often lead to this kind of problems and is basically the whole batch will be affected.
PaintPals
post Jan 23 2021, 06:57 PM

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QUOTE(ceo684 @ Jan 22 2021, 11:46 PM)
Buying paints from fast moving stock places (paint shops or popular hardware stores like CSM) will get fresh stocks. Sometimes painters cut corner getting old base stock from unknown places will cause the said issue?
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Certain batch of base might have the problem, can provide batch number to manufacturer directly to have them to rectify the problem. It could be the applicator but yea no harm to have them to rectify the problem for you.

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