Sponored by
Airbrush Technique Magazine
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Spray Guns
By Don Johnson / Airhead Airbrush.Com,
Inc. |
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This intended to be a brief over view of
spray guns used in cutom painting, an introduction if you will. It's part of an
article I wrote for www.airbrushartistmagazine.com
actually.
There are two types of spray guns basically siphon feed or
high pressure gun and the HVLP , which stands for high volume low pressure.
Both types come in pressure pot, gravity feed or remote paint reservoir
styles.
Spray guns unlike airbrushs require large volumes of compressed
airto work correctly. Spray guns require a 5 horse power compressor with at
least a 30 gallon air storage tank is adviseable. On the compressor you need
the following. air pressure regulator,moisture trap, and oil filter. More on
this subject when I get to the shop set up section of this web site.
As
with most tools you can buy a cheap model or a quailty tool. How much you spend
is of course up to you but if you plan on using the gun often I would suggest
buying a quailty spray gun ( $400 and up ). You can buy one gun and by changing
the head assemble and needle have the ability to spray many different types of
productssuch as primier, base coats , clear coats. Be sure to check with the
maunfacture's tech sheet for their recommendations in this reguard.
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gravity feed style gun
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siphon feed style spray gun
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High Volume Low Pressure HVLP
( pictured below)
atomization utilizes a high volume of air delivered at 10 psi or less to
atomize fluid material into a soft, low-velocity pattern. This reduction in the
velocity of the airstream over the 40 to 70 psi typically delivered by
conventional spray method results in a more controlled spray pattern, less
bounce-back and enhanced transfer efficiency. Transfer efficiency can be
defined as the amount of paint sprayed that goes onto the part as compared to
the amount lost to overspray and bounceback. HVLP can be used with all
automotive refinishing materials including primers, basecoats, clearcoats, and
single stages.
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Conventional High-pressure gun and how
it works pictured below.
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