Decorating new house and on one wall there was some light flaking covering a couple of sq cm's. scraped it back to good paint and prob. took off 1/2 sq meter. Paint left seemed good, so sanded down and applied coat of emulsion. within half an hour there were bubles on the old paintwork, which I could then scrape off. this has now been repeated several times on the same wall. Plaster skim under the paint is good and sound, no damp etc. Can anyone advise best way to cure this? does it just need a coat of PVA?
Cheers
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