I put some on a dryer vent that isn't attached to a dryer to keep the mice out and it's been there going on 2 years now. We live in a very dry climate though so that might be why.
Usually if you can put it on when it is warm outside, and it can get really sticky, it will stay. If it is a little cool out, you may want to put it on, and then warm it up a bit with a blowdryer.
I've seen people driving cars with duct tape holding on the outside mirrors or keeping plastic in place over a broken/missing window, so I am going to guess that it works outdoors just fine.
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