Been messing around swapping tubeless tyres on my own and mates bikes a bit recently.
I know it works but, Stan’s sealant ain’t cheap for what it is.
Either branded or sure fire ghetto style, what do folk use alternatively and are there any pitfalls ?

Stans or nothing. It’s worth the money. Just buy the quart bottle for value (yeah they measure American, it’s just about 1ltr)