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 Post subject: stain on new plaster
PostPosted: Tue Oct 03, 2017 2:17 pm 
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I've recently had a new kitchen installed and after the plaster had dried out, I noticed that there was an arc of around 30cm above the new wood work surface and just under a power point, that was dark in comparison to the new plaster. This did go away but did not feel wet, though there was a chalky film on the surface. Predictably, my first effort at painting over did not work (as flaking appeared within a matter of days) and so I treated the area with Zinnser B-I-N primer/sealer. I then coated with 2 coats of emulsion but the result is the same, though the paint stayed on longer.

The kitchen company then contacted their plasterer, who said his mix was consistent and that he had never heard of this problem before but thought perhaps there was something in the brickwork. There is an outside tap on the other side of this wall but the plaster never appeared to be wet...

Any advice happily received. Perhaps there is a stronger stain product that could be recommended?


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 Post subject: Re: stain on new plaster
PostPosted: Tue Oct 03, 2017 3:22 pm 
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BIN can sometimes fail if the moisture content is above 15% ( I think). Alkali resisting primer will be a better option in this instance. The chalky feel you describe sounds like efflorescence to me. I'd check the outside tap for any leaks too.

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