Regarding the Devilbiss Finishline, have a look at the specs at Highland
Hardwa

http://www.tools-for-woodworking.com...OD&ProdID=1776

"one a conventional suction-feed type with quart cup, the other a 32-oz.
gravity-feed type. The latter features excellent balance and lower air
supply demand; a good choice for use with marginal compressors."

I have this one:

http://www.harborfreight.com/cpi/cta...emnumber=43430

and normally use it with a 60 gallon compressor. But I've used it a few
times with a 6 gallon portable compressor (Hitachi 1.5hp, oil lubed) and it
worked fine for small projects. I wouldn't recommend always using it with a
small compressor though.

One thing you can't easily do with a gravity gun is spray upwards (for
example spraying the bottom of the top board of a bookshelf). Devilbiss
makes a disposable liner (like those reuseable baby bottles with the
disposable bags) which they claim will allow you to spray upward, but I've
never tried it.

Another option for small compressors is the Critter sprayer. It also has
the advantage of easy cleanup.



"mp" wrote in message
...
So what is the advantages/disadvantages of the different feed types?


Gravity feed guns do not use much less air, as someone else has suggested.
You'll find that guns which come in gravity, siphon, and pressure feed
versions have the same air consumption specs
http://www.homesteadfinishing.com/htdocs/walcom2.htm

Between the gravity feed and the siphon feed, it's mainly a matter of
preference. The gravity feed guns have the cup on top, are easier to
clean,
and are more convenient for spraying small amounts of finish. The siphon
feed guns have the cup on the bottom. Some people prefer the feel of a
lower
center of gravity.

The pressure feed guns are typically fed from a remote, pressurized pot,
but
you can also get pressurized gravity feed and pressurized siphon feed. The
pressurized feed remote pot guns are more compact and are easier to work
with in confined spaces such as cabinet interiors, and you can easily
spray
upside down or sideways without any problems. Because you're dealing with
larger containers and lengths of hose, remote pots aren't very convenient
for small jobs or frequent finish changes, but are great for production
line
work. Another important advantage with pressure feed guns is the ability
to
spray thicker paints and finishes. With a pressure pot and a large tip you
can even spray thick latex paints.