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Many thanks for the advice. Heating on and dehumidifier in!

Spots from insulated plasterboard fixings coming through 3 coats of paint.

We had a garage conversion completed with external wall covered with insulated plasterboard and skimmed. I left plaster to dry for 4 weeks until perfectly white. Dots were clearly showing from metal fixings used but only as faint darker spots so i started to paint. I've painted 3 coats of white...