Option 1: scrape the heck out of the ceiling. Fix, re-tape with mud if necessary, skim with mud? Seal it with gaurdz, do all the necessary sanding. Paint
Option 2: drywall over drywall using 1/4 inch drywall, mud and tape, first coat, paint
Option 3: plaster ceiling smooth,sand, paint
Op
Option 2: drywall over drywall using 1/4 inch drywall, mud and tape, first coat, paint
Option 3: plaster ceiling smooth,sand, paint
Op