I always have to crack up laughing when the discussion of which Iwata is better. They are all the best!
Seriously, it's what medium (paints) you're working with and what level of complexity you believe you’ll get to in your airbrush work.
The Eclipse series can do about anything you want it to, once you get familiar with that airbrush line. In my opinion they are the best all around airbrush for automotive painting, because the can handle the viscosity of auto paints without over reducing the paint too much. The Hi-Line series is great for details and mural work, but clogs easier with courser metallic paints and some pearls. If you’re spraying finer details in solid colors and reduce it a bit more, then The Hi-Line series does an outstanding job.
Now for Microns, I fell into that trap of Microns being the best. They are incredible brushes, but the most expensive out there. They can spray really fine lines, but you must decided if you need that extreme level or not. They can clog easily and maintenance on them is a bit more involved than the other Iwata airbrushes. I’ve sent my Micron B in twice to Coast Airbrush for service and a thorough cleaning to get it working properly again. I have a need for my Micron and think it does a great job, but for most out there, they really only need a Hi-Line, or Ecplise airbrush at a much lower price.
One other thing, you can achieve nearly anything with an $100 airbrush with the use of other tools (freehand shields, tape, paint mask and thousands of other objects) that make it look like you used a super high quality, mega expensive airbrush.
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