Bubbling old paint, unable to paint over

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steveburns04
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Bubbling old paint, unable to paint over

Post by steveburns04 »

Hello

I stripped the walls in my living room of the wallpaper. Underneath was painted plaster in poor condition. I sanded it down as much as I could and used polyfiller to fill in defects. I tried applying paint however lots of bubbles formed from the old painted surface. I didn't realise that at the time so bought zinsser peel stop clear binding primer and used that, but bubbles still formed due it being the old paint and not the new paint causing the issue. I have removed the bubbled bits with a scraper and sanded them down. However I am worried other areas with bubble that didn't bubble the first time, so wondering wether re-plastering is needed in this situation? I have shown some pictures. The only before picture doesn't show the affected wall much, but it is the pink coloured bit above the flaked yellow part. It is much bigger areas then in the photo but this was the only one I had. Any help and advice is appreciated. Pictures are attached.
Attachments
The pink bit at the top is the part thats peeling (theres more above it, this was the only before photo I had).
The pink bit at the top is the part thats peeling (theres more above it, this was the only before photo I had).
20200604_215456 (1).jpg (103.93 KiB) Viewed 194 times
Parts I have sanded
Parts I have sanded
20200611_181115.jpg (95.46 KiB) Viewed 194 times
Parts I have sanded
Parts I have sanded
20200611_181112.jpg (93.15 KiB) Viewed 194 times
Bubbled paint
Bubbled paint
20200610_191055 (1).jpg (64.18 KiB) Viewed 194 times
rozzleshnozzle
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Bubbling old paint, unable to paint over

Post by rozzleshnozzle »

G'day! I am also suffering the same problem. I have removed old wallpaper, scraped it all down, have sanded the walls, including the old paint. I then went and primed the bare plaster, and found where the primer had dribbled on the old paint, it started bubbling. So I started scraping.. and scraping. It has taken me 3 full days. To get to the point of replastering the damaged areas, and now it's day 4, 11am and I'm about to burn the house down. This was supposed to be one room, done in a few days and now I feel like I'm about to go mad.
Did you find you just had to bite the bullet and scrape it all off?
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wine~o
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Bubbling old paint, unable to paint over

Post by wine~o »

Common problem. Unless all traces of wallpaper paste are removed ten as soon as you apply any emulsion the paste re-activates causing the bubbles. Lots of elbow grease, plenty if hot water and a scotchbrite pad to remove wallpaper paste (may need going over several times) Once you are happy that all traces of paste have been removed, let the wall dry thoroughly before painting.

2 other options.

Apply lining paper and paint that or

Apply a full coat of zinsser Gardz before painting.
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rozzleshnozzle
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Bubbling old paint, unable to paint over

Post by rozzleshnozzle »

It happened to me on areas that as far as I know had no wallpaper. Would this indicate there probably was at some point ant the previous owner just painted over it?
wes56
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Bubbling old paint, unable to paint over

Post by wes56 »

I dont know anything about decorating but that looks like penetrating damp coming through the plaster.
Do you have outside render or CWI?

The only "cure" for that kind of thing is to knock off the plaster back to brick and redo it.
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bitzz
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Bubbling old paint, unable to paint over

Post by bitzz »

As Wine o says above, most likely to be wallpaper paste give a good wash down, dry then a good coating of Zinsser Gardz, then emulsion of your choice to finish.
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Puma
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Bubbling old paint, unable to paint over

Post by Puma »

It might be old fashioned white wash. See if it will wash off.

Also now on Top Dec

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