I went a different route and used Eco Paints on my old walls. They have a range specifically for historic homes. The prep was key - I had to strip back to the original plaster in some areas. It was a bit of a pain, but the adhesion has been solid. I used a moisture meter to make sure the walls were dry enough before painting. It’s been a year, and no peeling or flaking so far. Definitely worth the extra effort.
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