Hello. What I do is scrap any paint chipping off. I then use drywall compound and fill in the cracks with a putty knife. Once it has dried sand it down to blend to the rest of the wall. Sometimes a few coats will be needed. Then I prime the area and paint. Good Luck!
https://www.youtube.com/watch?v=kZy_eTMggVU
I'd love to try to help you, but I need to know what the walls are made of. More info please.
Hello. What I do is scrap any paint chipping off. I then use drywall compound and fill in the cracks with a putty knife. Once it has dried sand it down to blend to the rest of the wall. Sometimes a few coats will be needed. Then I prime the area and paint. Good Luck!