Thanks, George. Reading the reviews of the paintball tank/nail gun regulator, it
seems some people had reliability problems. I'm considering something like this:
http://www.offroadtuff.com/co2regulators.php
the best price I found was here:
http://skinnypedal.net/store/index.php?main_page=product_info&cPath=15&products_\
id=28

Off-road truck enthusiasts use them to inflate their (large) tires after
temporarily lowering the pressure for increased traction. I and get a 5 lb CO2
tank for about $60, and an air chuck, hose, and gauge (to avoid
over-pressurizing my rockets) for about $20, giving me an ample, easily portable
air supply for less than the price of a mid-size compressor.

--- In water-rockets@yahoogroups.com, "George" <air.command@...> wrote:
>
> Apollogies for the late reply.
>
> I don't have any experience with CO2 or paintball, but can try to address your
second question: