No, this isn't to keep them from rusting. Exposed nails can be a
source of roof leaks, so you put a dab of roofing cement / tar / caulk
on them to keep them from leaking. I would call these "shiners" and
would try to scout them out and seal them at the end of a roofing
job. It's not unusual to have a few errant nails and, as long as they
are taken care of at the end of the job, it isn't a big deal.
Tarring a half dozen nails ISN'T a heck of a lot of work.
On the WHOLE roof?! Never heard that one. Why? Alum nails for alum
flashing, yes. I would think the soft alum would jamb up a nailgun.
Coiled aluminum roofing nails? I'm no roofer. They make them? I've seen the
std galv everywhere and the cheap-ass zinc ones at Harbor Freight.
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