Seems to me you'd better have a very good aim to hit the bear where it will work.  I looked this stuff up on Amazon and apparently most comes in 9 oz. spray containers that inconsistently shoot at a max of 35 feet.  So, if you miss, and p!ss off the bear, you'd better have your rocket shoes on or some other reliable back up plan, because you're not going to have much of a head start on the angry bear.  

Maybe a better option, and less likely to be discovered by border and game officials, is a soaker squirt gun set up to shoot capsaicin extract.  I did find a 16 million SHU pure crystal capsaicin extract that is soluble in alcohol that you could load into the soaker squirt gun (provided you load it very, very carefully and don't put your fingers in your eyes or other delicate places afterward) that may be more effective against the bear as you have a lot more, the concentration is much higher than is permitted in the commercial sprays,  it's easier to aim, and the stream of the squirt gun exceeds 35 feet.  The principal drawback is that you better not get it on yourself as you shoot, .... only squirt down wind.  Just ask the bear to kindly move to a down wind location before you spray if the wind direction is not favorable. I've heard that Canadian bears are especially well mannered and cooperative in this regard.