How to prevent soot from showing through plaster ?

Alfielander

New Member
I’ve got a job upcoming skimming the inside of an old Coal fireplace and heard that soot can show through of the skimming, How do I prevent this !?
 
Grind it off, salt neutraliser, then run for your life.

Always think it’s better to sort out and re-point the brickwork.
 
I’ve got a job upcoming skimming the inside of an old Coal fireplace and heard that soot can show through of the skimming, How do I prevent this !?
To stop soot from showing through, apply a shellac-based primer or stain block to seal the surface before skimming. This will prevent any stains from bleeding through the plaster.
 
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