gc1967 wrote:Scrape it down again and refill and sand it all down and give it a good dusting down. Apply a coat of Zinserr over all the filler patches, all Zinserr to dry and then apply your top coats.
That's exactly what I did this time around, but I didn't Zinsser over the filler.
I would scrape off as much as I could and thoroughly dust area, I would then give the whole area a coat of Zinsser bin and allow to dry. I would then fill all areas with a good filler for example Toupret, once filler is dry sand down and dust, apply a coat of Zinsser bin over all of the filler and allow to dry, once dry apply 2 top coats of your wall colour. If it does it again after doing all of that then you definitely have damp coming from some where.
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