If I'm on the road I don't want to be taking a tyre off, getting covered in sealant, cleaning away sealant and then trying to get an internal patch to stick, unless I really have to.
I bought a 1L Effetto Mariposa Caffelatex Sealant (60ml, 250ml and 1000ml × 1) of him (cycleclinic).
I put ~30ml in a front tyre and then snapped the frame of the only bike the wheel was usable on. You're welcome to use some of mine if you want to test it.
https://www.youtube.com/watch?v=OfJXNQPZbJ0
If I'm on the road I don't want to be taking a tyre off, getting covered in sealant, cleaning away sealant and then trying to get an internal patch to stick, unless I really have to.