I have recently took out a solid fuel fireplace and replaced it with a log burner after making the recess larger. We unibonded the walls before plastering then let it dry out before painting it. Now rusty patches have appeared and we have been told that it could be hydroscopic salts coming through. The paint is proving very difficult if not impossible to remove. Can you put salt neutraliser over paint?
chimney,
Chances are that it is soot leaching through the paint surface as the wall dries out. Can only suggest you apply a few coat of stain-block paint.
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