how to repair popcorn ceiling water damage
1 Use a sturdy ladder to gain access to the ceiling. 2  Scrape off all the water damaged popcorn material until it is all removed and the stained ceiling is visible. 3  Vacuum or dust the ceiling to remove any left over dust. 4  Use a paint brush and prime the water damaged ceiling with a product called KILZ ceiling paint.f you have a HUGE area that needs to be repaired, consider doing it this way: 1  Scrape off everything in the damaged area. 2  Prime the large area and let it dry. 3  Rent a ceiling texture sprayer and use it to apply the popcorn texture to match the rest of the ceiling. 4  A ceiling texture sprayer is easy to use.