Hi
We have a house from the 1920s where we have removed woven wallpaper in the basement and need to fix the wall behind with filler/mortar. But I'm uncertain about the type we need to use.
It feels like there is lime paint on the outside but behind it seems to be some concrete/mortar-like material. Attached is an image showing the previous layer of filler (gray), lime paint, and concrete/mortar.
Bauhaus recommended Casco husfix but wanted to check here first. A real hassle to redo it otherwise. 😅