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I had a previous issue with the shower tiles leaking and damaging the plaster on the bathroom wall. This issue has since be remedied.

The tiles no longer leak, and I’ve had the wall checked for damp. There’s no pipe work in the wall and the outside is sound.

I filled the damaged area with Polyfilla, sanded smooth (see images). I then bought Dulux bathroom paint.

I left 48 hours for the filler to dry before sanding, and the desired time between costs of paint (6 hours).

Within 2 days, the paint has blistered up, not over the filler, but pretty much following the line of where the filler meets the original paint.

Any ideas?

IMAGES ARE IN REVERSE ORDER

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.

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.