[fourdeuce82d]

"a can of hornet spray and a lighter"

Foaming lye based oven cleaner doesn't have the reach, but it doesn't require a source of ignition, and it doesn't quit burning- little in the face and eyes goes a loooooooong way towards adjusting a naughty person's attitude...

[Alberta's Child]

I watched a demonstration of this "flamethrower" when my friend was working at an outdoor garden center a few years ago. He pointed this thing out the back gate, held the lighter up in front of it, and released the spray. A wicker plant basket hanging thirty feet away burst into flames and disappeared in about three seconds. The stream of flame wasn't more than an inch wide.