QUOTE: I read somewhere that it should be possible to add an airtank to our basic model comps'. I don't know if it is and what it would involve.Maybe somebody can enlighten us?
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It depends on what you want to do. In the simplest configuration, pick a tank, any tank as long as it's rated for the pressure (larger tanks take longer to pressurize and you have longer painting capacity with a single fill). Run a line from your compressor to the tank, and another from the tank to your airbrush. Turn on the compressor and fill the tank, then turn off the compressor and start painting.
The next step up involves a pressure switch. The pressure switch connects to the tank as well. When the tank pressure is below the low pressure set point it allows the compresor motor to start. When it reaches a high pressure set point it turns the compressor motor off.
The third step is to add a regulator. Without a regulator you will be spraying at whatever pressure is in the tank. Add a regulator to the tank outlet and you can adjust the pressure.
All three of these are what you normally get with a store-bought compressor with a tank on it. Is it worth the effort? Probably not. You can add all this on to an existing compressor and most likely spend as much as you would if you just went out and got a compressor with everything already installed.