How do I paint and fix peeling paint and hairline fractures on my indoor concrete (cinder block) walls? The popcorn ceiling is a mess too.
Alkali resistant mesh tspe, 1 m wide, embedded in a modified (latex plasticizers, usually) mortar that you would skim coat over fine cracks.
This will also cover larger cracks, if it is stable (> 1 yr).
Use a stiff wire brush or wire wheel to prep. Use any recommended surface bonding liquid.