How do I stop paint effervescing on newly painted walls?

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we are renovating a 150yo settlers cottage in Australia. We've treated and fixed salt damp replastered the walls inside and out (walls are stone 400mm thick) and they've been left for months to dry. We've just finished painting and there are spots inside and out where the paint bubbles and comes off. Plaster is fine underneath. Why is this happening in some spots and how do we stop it reoccurring? Thanks

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