See my earlier posts about aerosol spray cans and an ignition source. If you need to use fire as a defesne, a poor man's flamethrower would be more effective and a lot quicker to deploy IMHO. Also a lot less likely to be viewed as any sort of risk by some would-be company rep.
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The ultimate result of shielding men from the effects of folly is to fill the world with fools.
-- Herbert Spencer, English Philosopher (1820-1903)