hydroscopic salts Ask your questions and find answers on many subjects relating to plastering and dry lining

[chimney]

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?

Many thanks

[stoneyboy]

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.
end

[chimney]

Many thanks Stoneyboy for your help.

I will do as you suggest and see if that works