In contrast to spraying with compressed air, the airless atomisation is created solely by material pressure without air. An electrically, pneumatically or fuel-operated pump places the material under pressure and forces a defined amount of material at a maximum pressure of 250 bar through a nozzle bore. This transforms the material into a spray.

In the AirCoat procedure (airless + air) the material is forced through the nozzle using a reciprocating or diaphragm pump with a relatively low amount of pressure (30 - 120 bar). The amotizing process is supported by compressed air (0.5 - 2.5 bar). This is made possible by the air cap that is centrally located directly on the nozzle bore which surroands the spraying medium like a sheath.

FineCoat is a low-pressure spraying technique that works with high air volumes and low air pressure (up to 0.7 bar). A turbine generates the atomising air which flows through an air hose and atomises the paint via an air cap. The atomising air is also used to pressurise the paint in the cup. This delivers the coating material through the standpipe to the nozzle and atomises the remaining air.