Bears will act aggressive for different reasons, these will determine the effectiveness of the spray. Having been bluffed many times by sow's with cubs has actually put me at ease having witness how they react in person.
Few years ago i got a elk down which attracted a bear that was so aggressive it followed me over a 1km before turning and going back to claim the elk, i used my spray and a few rifle shots in the ground to try to move him off and he didnt even flinch.
If the bear is older or injured its after you for the easy meal and this is the bear where the spray may stun but chances are he or she will circle back.
A healthy bear wants very little to do with humans and will use the bluff charge or huffing to signal this, my best advice is have the spray more accessible than your cell phone is daily to you because they move faster in short distance than you can image and know how to use the spray. Spray it off to test it, watch a video to understand the angle you should spray and most important you need to play the wind otherwise you just sprayed
yourself. (if you have tested it/sprayed it off get a new can the following season)
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