[veloman]

I know there are compressed air sealants that are for this purpose. But the other day I plugged my tire at home really easily. I had a 3/16" screw to pull out.
Why not just carry those slim jims, simple tools, a bike pump(yes I've filled a car tire with one. Its a workout. Though if the bead is broke it wouldn't work) and also the rubber cement (I bought a can, shouldn't dry out nearly as fast). Isn't it better to plug the tire properly anyway?

Of course this doesn't help with a sidewall cut. But for the cost and weight savings it seems a lot better than having nothing.

Or should I just buy the flat fix can? What's the success rate with those?

For long trips I'd carry the spare.