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Blotches on painted walls


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I’m in the process of repainting our hallway. The previous owners had painted the walls before we moved in (rather poorly) and when I have applied paint over some of the areas I get blotch marks like the ones in the photo.

 

99% of the walls get good coverage, but there are some dodgy areas. I need to apply 3-4 coats to cover these marks.

 

Any idea what could be causing them?

8D68655E-FAC4-4891-B8BE-2411AD5494D8.jpeg

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Plaster looks as rough as toast. 
 

If that’s a “new” opening then I’d wonder if damp has got behind the plaster or if it’s been done with sand and cement. 
 

Scrape the top off and see what’s underneath. Could be mould, damp, or just poor preparation but I wouldn’t be doing anything over the top and sealing in crap like that. 

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