I haven't used mine yet as I've been waiting for it to rain. I have watched a few videos and you don't need to fry the weeds til they crisp to ash .. just enough to cause them to wilt. When I do get around to using mine, I'll have my sister follow me around with the hose.
Human beings, who are almost unique in having the ability to learn from the experience of others, are also remarkable for their apparent disinclination to do so.
Douglas Adams