As already mentioned, some way to control the air pressure is vital and, thankfully, most modern compressors aimed at the modelling market now offer some form of control as standard, or as an optional extra. Control may be in the form of a knob on the compressor or as part of an integral moisture filter and/or bleed valve (see below) fitted to the compressor’s air outlet. Alternatively, an ‘in-line’ option is available, consisting of small connectors that fit between the airbrush and hose. These work by bleeding a controlled amount of excess air out of the hose, thus reducing the pressure at the airbrush.
A compressor with a reservoir tank offers a smooth airflow and keeps noise and mechanical wear to a minimum.
Right: Some form of pressure regulating control is a must, while a pressure gauge is desirable.
Above: Combined pressure regulators, gauge and moisture filters are available as separate units that simply connect into the air line.
Left: A cheap alternative is to fit an in-line pressure control valve between the airbrush and hose.