Plastering over glue left by polystyrene tiles

Joined
5 Sep 2012
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Location
Lancashire
Country
United Kingdom
Hi, Friend had some work done, removed polystyrene tiles then skimmed. This was less than a week ago but the plaster is showing up where the glue had been. Not sure if walls were PVA’d before plaster, what next? Stain blocker? Need to see if the plaster fully dries out. Any help, advice welcome.
 

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