moisture trap

first of all, it depends on what compressor your using! most compressor's feature built-in moisture traps, it's the only way of preventing moisture creeping back up the air hose, into your brush and on to your work!!. by moving the airbrush closer to the surface, the finer and stronger the line, the further away, the broader and weaker, and try adjusting the nozzle.

30-PSI (2 bar) is about the normal operating pressure for airbrushing!!

hope that helps.  

30-PSI (2 bar) is about the normal operating pressure for airbrushing!!

I disagree, but if it works for you then go for it.  The only time I use pressure that high is to clean my airbrushes.  I normally paint at 10 to 12 psi.

The pressure necessary will depend on the construction of the airbrush and the viscosity of the paint.  Use only enough pressure to get proper atomization and paint flow.  This will help limit the amount of overspray.

I would agree with you that 30 psi might be a little high for the 350, and yes your right, it does depend on what type of airbrush your using, i use an olympos HP-100 c independent double-action and have use it varying the pressure between 15-30 psi for years and got different results by using the trigger action, for example, you can control the flow of air and paint at the same time. 

ps1scw wrote:

1: Is there difference between moisture traps, is there a type that you recommend, do you use a moisture trap?

I now use a Badger inline trap.  You can buy it separately and splice it into your hose or buy a hose with the trap already fitted.  Although I do have trap/regulator fitted to my Bagder 180 compressor, I found that some moisture would occasionally shoot out after an extended paint session with my Paasche H and it's six foot hose.  The in-line trap eliminated all problems. 

ps1scw wrote:

2: Will a lower pressure setting give me finer lines, high pressure wider coverage?

To a degree.  When painting a fine line, you have the brush really close to the surface with low pressure (10 PSI-ish) and a nearly closed tip.  When you want wide coverage you pull the brush back, and open up the tip and usually you'll need more pressure depending on how far off the surface you are.

ps1scw wrote:

3: I was experimenting with between 20 - 30 psi, what psi do you brush with?

I might be as low as 10 PSI for doing narrow lines.  For normal use probable more like 15 PSI and maybe up to 20 when doing broad coverage.  I think I use a little more air pressure for my Paasche H than I do with my Badger 200NH.