How to prevent soot staining ?

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Alfielander

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I’ve been asked to plaster the inside of an old coal fire place and have heard soot can bleed through skim, How do I prevent this ?
 
Alfielander said:
I’ve been asked to plaster the inside of an old coal fire place and have heard soot can bleed through skim, How do I prevent this ?
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Running Man Abandon Thread GIF by MOODMAN
 
Alfielander said:
I’ve been asked to plaster the inside of an old coal fire place and have heard soot can bleed through skim, How do I prevent this ?
Click to expand...
Bitumen, throw some sand at it when its still wet to provide a key
Or If its not too bad just PVA it then spray it with stain block next day.
 
Alfielander said:
I’ve been asked to plaster the inside of an old coal fire place and have heard soot can bleed through skim, How do I prevent this ?
Click to expand...
I think if you need to prevent soot from bleeding through, seal the surface with a stain blocker or use a PVA solution before plastering. This will help stop the soot from affecting the skim.
 
I would cover the area that has soot contamination with building felt. fit EML this may have to have plug and screw fixings. Then float and set the area.
 
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