The aresol can method is like a bomb exploding. The can empties in about 5 seconds and you have to be ready, no room for errors and it is very expensive.
I do not mess with any work with popcorn as I have found and others have stated that it is very hard to patch popcorn and not to show the patch when all is done.
The very best method is to rent a hopper and a air compressor and shoot the ceiling and feather the new popcorn over the existing ceiling.
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