hi i have a flat i rent out and it was plastered out a few years ago. in a few places the emulsion paint on the ceiling has started to bubble and blister, any ideas what could be the cause or better still a remedy for repainting. thanks russ
Straight from DuluxTrade website How do I resolve blistering of paint on plaster? Blistering can occur on plaster if you overcoat solvent-based paints such as gloss or eggshell with a conventional emulsion in an area that suffers from high levels of condensation. To resolve the problem, scrape back the blistered paint until you have a firm edge, feather lightly with abrasive paper and dust off. Now spot, prime and bring forward any bare areas with Dulux Primer Sealer, using Dulux Trade Alkali Resisting Primer on friable surfaces. Finally, repaint the surface using a thinned first coat of water-based Dulux Trade Quick Drying Eggshell followed by one or two full coats. You don't have to use Dulux but do make sure it's trade quality paint. Good Luck
Russ, we need more info....to follow on from deadon's post...it was new plaster yes, did anyone paint oil based paint on it and then emulsion or water based paints?....maybe they did, please tell us. There are a variety of reasons why paint would bubble but we need more info. How thick was the plaster, how long before it was painted and with what? What are the conditions in the room, is it a room that suffers from condensation, is it a bathroom or a kitchen. Cait
cheers for the replys it was skimmed over the existing painted ceiling, pva then multi finish, left to fully dry then painted with water based emulsion, its on a small ceiling thats part of a large stair case, but its only in a small local area about 6" dia. when other parts of the same area were plastered some of the plaster fell while it was being applied and took a thick layer of paint with it, hope this helps. thanks russ
PVA is your problem. The paint is delaminating. Not a lot you can do. Scrape back the bubbles, sand smooth/prime/fill as necessary and recoat. Don't expect it to stop, it may well spread to other areas Not sure what you mean here... when other parts of the same area were plastered some of the plaster fell while it was being applied and took a thick layer of paint with it, hope this helps. sounds like there wasn't a lot of prep done before plastering...that the plaster/ paint was live...but I may be misunderstanding you. Cait
Another question, what is on the ceiling under the stuff that has come off? How old is the building in general? Has there been any history of anything leaking over this area? Burst pipes, plumbing work? Any of this stuff could cause your problem, looks like there is not sufficiant prep done before plastering. Nothing new here!
thanks again. under the paint is the new plaster, it was built in 1830 ish, no leaks in the last 5 years and no evidence of one previous. when it was plastered, as the plaster was drying it bulged and basically fell from the ceiling taking the existing paint with it, forgot to mention aswell, when parts of the ceiling were painted with the emulsion, that lifted the existing aswell and had to be scraped back. cheers russ
Plaster is at fault! not enough prep work, nothing to do with the paint. You might? only just might, get away with an oil based plaster primer as a first coat, this should isolate all under it and leave you with a sealed surface.
Zinsser's Peel Stop is an interesting one too...I have only recently started using it so can't give you long term reviews. Check it on their website.
I have just emulsioned my walls and it's blistering all over the place! I've put emulsion over emulsion so what's causing it? It's not new or damp plaster! It was last decorated 5 years ago and it didn't blister then! I thought it might be coz I've put matt over silk but when I put silk over matt it did the same blisters all over? Anyone got any idea?
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