Hello
We had a brick wall that had been painted with some acrylic paint.
I removed the paint by scraping with a knife.
Then I "slammed" the wall with KC-BRUK.
Afterwards, I "painted" the wall with HYDRAULIT-FÄRG from Målarkalk in Hyllinge.
http://www.malarkalk.se/
It turned out well.
They surely know the answer.
Best regards
Axelman