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Patch a water-stained popcorn ceiling
Once the ceiling is dry, remove any loose or flaking texture (Photo 1). Wear a dust mask and safety glasses to protect yourself from falling debris. Spraying the stain blocker and ceiling texture are downright messy affairs, so tarp off a work area as shown in Photo 2. Many aerosol paints don’t spray well upside down, but the stain-blocking primer in Photo 3 is designed to spray up (Kilz Upshot is available at home centers and hardware stores).
Applying the new ceiling texture (Photo 4) is the trickiest part of the whole project. The texture comes out fast and the propellant dissipates quickly. You’ll only get about four seconds of spray per can, so you may want to purchase an extra can and practice on a sheet of cardboard. The texture repair is designed to match the original white ceiling texture color, but you might have to repaint the entire ceiling to completely hide the patch.
If you have ceiling texture applied before 1978, it may contain asbestos. This mineral can be hazardous if it becomes airborne, so call your local health department to learn safe procedures for removal and disposal.