Lay a dropcloth down on the floor to protect it from falling debris.
Scrape off the remaining popcorn texture in the damaged area. Scrape down to the drywall with a putty knife.
Sand the area smooth removing any remaining popcorn texture. The new popcorn may not stick properly if the area is not smooth.
Patch holes or cracks with spackle. Allow the spackle to dry for 24 hours.
Prime the area using a paint brush. Allow the primer to dry for 24 hours.
Spray the primed area with the Homax repair spray. Hold the can 9-14 inches from the ceiling surface and spray lightly in a downward motion.