March 7, 20206 yr 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?
March 7, 20206 yr 1 hour ago, Home Farm said: ... and when I have applied paint over some of the areas I get blotch marks like the ones in the photo. .... Any idea what could be causing them? Lack of appropriate preparation
March 7, 20206 yr 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.
March 7, 20206 yr Since you are there for a long time I would look underneath the surface as suggested. You can sometimes bodge these with a stain block, but not for this situation.
March 7, 20206 yr I wonder if it’s had a silicon waterproof coating on it and now the paint is separating as it cannot sink in.
March 8, 20206 yr Author It could be damp as there is a waste pipe behind that. Will turn my attention to it next week and find the underlying cause. Thanks for all the feedback.
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