Stained wall

Joined
9 Jun 2014
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Location
Yorkshire
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United Kingdom
I have just plastered a bathroom wall which had an area of a tar like product on it (maybe old paper at some point?)

Anyway i pva'ed the wall and reskimmed it, but the tar is now showing through as you can see in the photo.

Does anyone know if i could just use a stain block on this problem or do i need to take off the plaster and redo it. Alternately i could tile over the area, but would prefer not to.


View media item 82056
 
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Possibly could have been some tar based water proofer !! Zinnser probably the way to go.
 
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