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Forum topic by 404 - Not Found posted 07-17-2013 08:17 PM 617 views 0 times favorited 3 replies Add to Favorites Watch
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404 - Not Found

2544 posts in 2435 days


07-17-2013 08:17 PM

It’s a long story, but I’m going to be doing some painting for someone in the next week or two. They have a problem patch above a shower in an en-suite bathroom. My guess is that the ceiling was originally painted before the plaster was thoroughly dry, and the guy with the roller didn’t dilute the first coat of paint.
The problem is, no matter what they put on the bad patch, it just bubbles off. Apparently, this has had all kinds of special paints put on to try to cure the problem, but alas, to no avail.
So, any ideas what to use to fix this problem once and for all? It’s plasterboarded (dry walled) with a skim coat of plaster (not taped and jointed).
Thanks in advance.


3 replies so far

View Earlextech's profile

Earlextech

1159 posts in 2157 days


#1 posted 07-17-2013 08:24 PM

I would try Zinsser Seal Coat first and then a coat of anything.

-- Sam Hamory - The project is never finished until its "Finished"!

View Mark Shymanski's profile

Mark Shymanski

5314 posts in 3179 days


#2 posted 08-08-2013 10:41 PM

+1 tacking on another sheet (or removing the offending sheet and installing a new one).

-- "Checking for square? What madness is this! The cabinet is square because I will it to be so!" Jeremy Greiner LJ Topic#20953 2011 Feb 2

View 404 - Not Found's profile

404 - Not Found

2544 posts in 2435 days


#3 posted 08-08-2013 11:13 PM

After Earlextech’s recommendation of Zinsser Seal Coat, I looked it up online and asked the homeowner to pick up a litre from the paint shop (she was going anyway). She arrives back with Zinsser Perma-White. I knew I should have gone myself. The reason I wanted the Seal Coat is it has a shellac base, so shouldn’t have affected the paint that was already on the ceiling. I did a really thorough prep job of the ceiling, scraping back the loose emulsion (latex?) paint, did an adhesion test, as directed on the back of the tin (with tape to see if the paint would pull off) and then feathered all the sound paint back into the plaster using a sander connected to a dust extractor. Cleaned it all down and started rolling the acrylic Perma-White on the ceiling.
That’s when the fun really began, the old paint bubbling up and peeling off, wrapping itself around the roller, dropping on me, the floor and cabinets.
So then I had to clean it all off again, just peeling it off and trying not to get paint on everything, and managed to get a good even coat on to bare plaster. Waited 2 hrs before recoating (as directed on tin) and gave it another coat.
The second coat went on without any issue at all, so I hope that is a preliminary indicator of how well the first coat sealed the plaster.
Only time will tell if this has cured the problem.

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