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Thanks Airhead, good to know and makes life easier. Wasn't fun scraping off the affected area (literally hundreds of small bubbles all over the wall, real trypophobia trigger)
Interesting re Gardz - it is walls in question but filling was minimal. I thought it would be the undercoat because of the difference in how the walls reacted vs ceiling (no bubbles there). Both got a topcoat of Benjamin Moore Aura Bath and Spa but only the walls had an undercoat of Berger Matt Emulsion because the old paint was dark.
Nelly
Airhead
In the 20+ years I've been using it I've rarely left it to cure for 7 days. If you are talking about walls rather than woodwork it might be worth considering a coat of Gardz from Zinsser. Your problem with bubbles could be related to filler if you've had any filler on the walls.