Running a fantastic basement project, beyond exhaustion - and now working on finishing walls. (Should have been before the floor: I know). Anyway, I'm using a fantastic scraping tool after having gone through steaming/wire brushing and diamond grinding to remove wallpaper. Now I'm wondering what is recommended for prep work before silicate painting? Interior concrete walls fully clear. Exterior walls of siporex, with some old filler left. Never had any moisture issues (white in the photos). How should I even out after scraping? Sand?? Do I need to improve the filler? Can I risk it? Traditional plastering is not feasible = too difficult / too heavy.
What do you say?