If they are truly hairline cracks just filling them in with drywall compound should work. Fiberglass mesh tape was made for repairing cracks so that would be the next step up. You have to fill it in completely and blend it in.
If the cracks are deeper or you suspect more damage beyond the surface than you can see? Then you will want to use the tip of a sharper scraper to dig them out and fill them. I would use hot mud or real plaster for anything substantial.
Caulk would not be a material of choice for me as it does not level flat easily.
Be sure and prime all repairs and patches.
If the cracks are deeper or you suspect more damage beyond the surface than you can see? Then you will want to use the tip of a sharper scraper to dig them out and fill them. I would use hot mud or real plaster for anything substantial.
Caulk would not be a material of choice for me as it does not level flat easily.
Be sure and prime all repairs and patches.