Nestor and others... In the 1960's era house where I live, I have a ceiling issue in the kitchen. Particulars: 2 story house, kitchen first floor - under A/C handler A/C was added to the house well after the house was built, parts of ceiling in kitchen was lowered to create air space between 1st and 2nd stories for ductwork/returns/etc. Air handler is on it's side, in a 'doghouse' (it's own gambrel dormer) on back side of house. Right over the kitchen. About 6 years ago, a new drain line (overflow from A/C pan) was created so the pan wouldn't overflow. Idea was to redirect the water dripping to a non-patio area. New system did not work well, was rerouted back to original set up some months after. The A/C pan did overflow, and caused water damage to the downstairs ceilings in the dining room, bath, hall and kitchen. I also have questions about if there's a condensation issue - with condensation off the ductwork dripping onto ceilings in various places as well. So what do I do to fix this? I DID paint the ceiling with bleach first (to kill mold if any). Then a YEAR later painted the ceiling stains with Kilz - three coats. The stain bled through. Next I painted it with 2 coats of 123 Z. Stain bled through. Is this normal? I would have thought that FIVE coats of microban, mold killing, primer would have done it... but it hasn't. Husband has checked the a/c, the pan, the overflow pipe - and does so about every 6 months. He makes sure things are clear/clean, not obstructed and such. According to him, we've not had an active leak since this happened (over 5 years ago). Because the staining and leak area goes through three rooms... if I tear out the ceiling... I'll have to tear it out around several walls. Right? I shudder at the thought. (I'm short... and trying to do major drywall, over my head is a daunting thought... even using scaffold and jack holders.) I simply don't know enough. I don't want to bring down the ceiling in 4 rooms! Any advice? The kitchen is the worst. The drywall actually looks damaged there and so I figured I'd have to cut out a part and do a 3' by 4' patch or something.