Single Action Airbrush
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Single action refers to how you work the airbrush. Each control on a single action airbrush operates a separate spray variable.
Like the photo shows...
Press down for air.
The
button, or trigger, controls airflow. It's an on/off device.
Don't try controlling airflow or air pressure here.
That's
what regulators are for.
Twist out for paint.
Twisting the knob out,
counter-clockwise if you're looking at the back, starts paint flow and
increases paint flow until you twist the knob completely out.
The Good
Easy to use
The
separate paint and air controls make single action airbrushes
easier to use than
double action airbrushes. This allows you to concentrate on
moving your hand instead of concentrating on
how far back your finger is.
Repeatable spray
Twist
the knob out and it stays there until you twist the knob back
in or out
further. This keeps the paint flow steady. Steady
paint flow makes it very easy to repeat what you just did.
Scientists and researchers love these airbrushes because of the steady paint flow.
Scientists and researchers love these airbrushes because of the steady paint flow.
The Bad
Dagger strokes are almost impossible to do.
Dagger
strokes on single action airbrushes are difficult (most people
say
impossible) to master.
The technique requires a steady change in paint flow while
you
move your hand. It's hard to adjust the back end of the
airbrush
while moving it. You are, of course, completely welcome to
try it
out for yourself!
The fluid knob must be reset whenever you remove the needle.
Resetting
the airbrush whenever
you remove
the needle is imperative. Remember, the needle ALWAYS
controls
the airbrush's paint flow rate. The knob
conveniently adjusts the needle in or out.
Normally this small problem isn't a big deal. You occasionally forget and have to trouble shoot why your airbrush won't spray anything. No problem.
Just make sure that whenever you remove the needle that you reset (screw in) the fluid adjustment knob. No big deal.
Normally this small problem isn't a big deal. You occasionally forget and have to trouble shoot why your airbrush won't spray anything. No problem.
Just make sure that whenever you remove the needle that you reset (screw in) the fluid adjustment knob. No big deal.
The Guru's Opinion
Single action airbrushes have their place. If you're a researcher or scientist, if you need something simple and don't mind the few pitfalls, or if you're just plain stubborn, you have my blessing. Go get one.But most people, despite the few added headaches, should still use double action airbrushes. Most manufacturers make adjustable parts that mimic all these benefits, then you can have the best of both worlds.
