Hope someone can help me here is the problem.
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?