How do I prevent older paint peeling off drywall when applying new paint?

2017-12-14 05:33:02

We have moved into a house where the drywall walls were painted about 15 years ago.

When I paint over these walls, the existing paint develops patches of bubbles and peeling.

So, I don't know whether the cause is walls that were poorly primed in the first place, but I guess it doesn't matter so much as what I need to do now to repaint. Clearly I can patch the specific areas which have peeled but I would like to avoid this as much as possible.

Is the best thing to do to re-prime before painting? If so, should I use diluted PVA or is there a better alternative?

Many thanks!

Ooh. this problem is one not easily answered without more info:

Heat Blisters:

Paint bubbles can show up pretty quickly, from within a few hours to a few days after application. The blisters are only in the top coat of paint and appear most often in oil-based paint. A quick rise in temperature, like sunlight shining directly on the newly painted wood, causes a thin skin to form on the outer

  • Ooh. this problem is one not easily answered without more info:

    Heat Blisters:

    Paint bubbles can show up pretty quickly, from within a few hours to a few days after application. The blisters are only in the top coat of paint and appear most often in oil-based paint. A quick rise in temperature, like sunlight shining directly on the newly painted wood, causes a thin skin to form on the outer surface of the paint. The skin traps inner wet paint that produces vapor when it heats up. The vapor expands and causes the paint to blister from underneath.

    To repair blisters, scrape them off, smooth the edges, and repaint, being sure to avoid direct sunlight while the coat dries. Experts suggest establishing a painting order that follows the sun around the project. Thick coats and dark colors are more likely to blister than light colors and thinner paint.

    Water Blisters:

    Moisture causes problems for paint. Rain, dew, ice, and snow on the outside or vapor and moisture buildup from the ins

    2017-12-14 05:59:42
  • It's hard to say what exactly is causing the problem. I have seen it happen when wallpaper was removed and some glue was left on the walls and painted over with latex.

    The best solution is to prime with a oil based primer such as Kilz to avoid future problems. Scrape whatever is visibly cracking or peeling, then apply the Kilz to the entire room. Repair the cracked areas with spackle or drywall compound. Now you can finish with latex paint. This should solve the problem regardless of the cause.

    2017-12-14 06:01:25
  • I just had a similar problem. My ceiling paint was peeling off in patches after I applied a water based primer. It peeled down to the drywall paper. It appears to me that the contractor either did not prepare the surface correctly to get good paint or primer adhesion, or he did not use a proper first/prime coat.

    I have taken to scrapping all of the bubbled and peeling paint. My next step will be to lightly sand the newly exposed drywall paper and re-prime. Unfortunately, it is difficult to make the surface smooth because of the line between the remaining adhered paint and the spots that I scraped. I suppose a lot of careful sanding can smooth these transition lines.

    2017-12-14 06:18:05
  • Best, well actually only solution is to remove old pain and primer completely. When you finish this then you apply new primer and wall paint. Don’t get into the reasons why blisters appear because it is not relevant.

    2017-12-14 06:38:04