Pete C. wrote:

One other note: I'd be concerned about using CO2 in my air tools with
the greater cooling effect than air, unknown effect on tool lubrication
and potential for accidentally feeding liquid. The solution is easy
however, just get air fills from a SCUBA shop instead of CO2. It's
cheaper as well.

And it comes at pressures much higher than a paintball CO2 tank is
safe with.

CO2 at room temperature is in the 850 psi range, though it can get way
higher on an overfilled tank.

Paintball High Pressure Air tankks (HPA) are a whole different kettle
of fish, both in pressure capacity and price as well. Both are much
higher than for CO2 tanks.
HPA tanks will happily take a 4500 psi fill, if you bought the good
ones. CO2 tank burst disks are rated at 3000 psi.

Filling a CO2 tank to it's rated pressure with air would get you about
the same number of shots (nails, staples) as you would get from a CO2
fill without any liguid CO2. Not really worth the effort if you have to
run to the fill station more times than you have to reload the nailer.

By the time the CO2 has travelled through the reg and hoses, (where
the reg limits pressure to 100 psi or so) you can be pretty sure that
liquid CO2 is not an issue. Hoses would blow if the liquid got that far.
At least the ones between the reg and the tool, wher e you can bet they
are not selling you a 3000 psi rated hose to feed a 100 psi rated nailer
or stapler.

So. Air from the Scuba shop is about second in the list of bad ideas,
right after using pure oxygen. :-)

Cheers
Trevor Jones