what type of primer for bare old plaster in humid location

ILIKEFOOD

Hi All

The house has above normal levels of humidity. Some of the plastered walls had lining paper straight on to the bare plaster - this paper came away pretty easily. The same for some of the painted walls. I suspect it was so easy because of humidity...or perhaps neither the paper or the paint were applied properly.. eitherway I have bare plaster walls that I want to paint and I'm wondering what type of primer should I use here?

Most of the walls are painted and do not appear to be flaking so I'm just going to sand and paint onto those ones...

Deregos.

You shouldn't really need a primer if they're anyway decent walls. Just prep well (wash off any paste residue) and thin the first coat of emulsion around 25% so it penetrates the surface somewhat then fill, light sand down and paint as normal.

https://www.boards.ie/discussion/2058231807/what-type-of-primer-for-bare-old-plaster-in-humid-location