i am not a lover of tube sealant…call me old fashioned….a good quality tyre should suffice …that said, the role the cargobike has in our busy life means that a puncture is a real downer…a day killer…..I look after some of the fleet bike for couriers locally, so when i see that they use these tyres…and my experience swapping tyres over for a mate and seeing the 3 thorns stuck in his inner tube with slime all around and he was unaware (perhaps that says more about him) anyway….i am happy that they work, a good thing to make available…other option is the Schwalbe air plus….either big ben/plus, pickup + good inner tube…rest easy(er).

https://road.cc/content/review/81257-slime-smart-tube-self-healing-inner-tube