Q:We are getting ready to repaint our home office. The walls and ceiling were cracked during the 1989 quake and poorly patched before we moved in. We had the roof redone this summer, and the banging ...

A: It depends on the type and size of the crack. Hairline cracks take only a little patching plaster. Larger cracks require reinforcement with mesh tape. Cracks larger still, where the plaster keys ...