Same reason you have to have the nozzle of the gas pump in contact with the
filler tube when pumping gas. The flow of the gasoline creates static
electricity, but no arc will be produced if there is a metal to metal
contact.
>I used to do a lot of automotive painting and always make it a habit to
make
>sure things are grounded well. I watched a guy cleaning out a paint pot
one
>time using lacquer thinner that was being pumped through a hose, he had his
>thumb over the hose spraying the thinner and it actually ignited from the
>static charge being generated by the spraying of the thinner....wouldn't
>have believed it if I had not been there!
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