Yeah, it probably gets hotter in a car than on a bike, by a good bit.

If it wasn't intended for bikes, I'd be reluctant to try it on a bike, though. The pressure it puts out may be too low or two high, may air it up too fast, or get too much slime in there. And I've never really trusted slime-type products- saw it used long ago on truck tires, and it seemed like it only postponed the problem, then made it gooier to fix.