The original builders magnolia seemed fine. After a few years we repainted it, got the tiny bubble thing going on then, we assumed it was the Dulux emulsion not being great.
So when we re-did it a few years further on we asked around, told "PVA then paint" so did that on the 3 problematic...
Original plasterboard may not have had mist coat by builder (not on 3 of the 4 walls anyway). When painting we get tiny bubbles in patches, they have not gone when the paint dries (house is 20 years old now & painted 3 times - spare bedroom!).
Clearly something has been wrong all this time...
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