Originally Posted by
CrimsonEclipse
As a former tire guy (cars and trucks)
Fix a flat should only be used in emergencies. I hated that stuff.
I see no difference in car vs bike tires in basic chemistry so it's probably a marketing thing.
Three possible differences: 1) Imbalance issue, bike tires are more sensitive, although car tires spin faster. 2) Hazard due to propellant, possibly flammable. 3) Contents may degrade bike tubes, or inside of tire, car tire compounds may be more resistant, or just doesn't work with tubes, only for tubeless.
EDIT: 4) Volume difference, can of fix-a-flat could blow up (explode) small tires.
And yeah, I hate the stuff too, imbalance and a mess inside.