Hello! I have a hallway in a 1940s apartment where I plan to put tiles in one of the corners (where clothes are hung). The walls are aerated concrete with lime mortar. I've removed all the loosely attached old layers of wallpaper and paint. The innermost layer resembled something like milk paper (but not directly moisture-resistant), and underneath it, it looks like the wall is painted with matte woodwork paint. However, that is NOT the case. When you wet a cloth, it rubs off. A bit powdery when dry. At first, I thought it was glue paint, but it seems a bit too thick and hard for that. Has anyone ever primed lime plaster with lime paint/glue paint before wallpapering? I know the other rooms were redone in such a way that all loose wallpaper layers were scraped down, then primed with alkyd paint (not water-based, that is). I was thinking of using Beckers binder / wallpaper primer (but the wallpapers have been scraped off because they were loose). On top of this, it will be roll-on plaster and Microlit.
How should I put up the tiles? Glue on the Microlit? It's not about large quantities... And no wet room barriers...
Very grateful for an answer!
How should I put up the tiles? Glue on the Microlit? It's not about large quantities... And no wet room barriers...
Very grateful for an answer!
Answering myself in case anyone has similar questions.. . 
Took a renovation grinder and ground off the old paint, then applied primer and filled with gypsum. Then slap on primer and tiles.
Took a renovation grinder and ground off the old paint, then applied primer and filled with gypsum. Then slap on primer and tiles. 
I'll get back with a picture. Right now, there are sheets of plastic hanging to protect the nice tiles while I splash around with paint (I know, wrong order + I haven't really had time to finish...) I was also thinking of putting up some kind of built-in hat rack.
I was also thinking of putting up some kind of built-in hat rack.