Jimmy in NC
Addicted to ArboristSite
John, what about a tiger torch/roofing torch/pear burner/weed burner? Could work well. Or find an army surplus flame thrower.
I guess if you were tired of mowing, you could find a farmer with a crop sprayer. Just round up the whole lawn.
Like John said, just isn't as permanent as you'd like. My old neighbor burned his driveway weeds almost every other week. I spray 3-4 times a year and that's it...