NOZZLE AND NEEDLE CAP SHAPE
Paint emerges from an airbrush in a cone-shaped pattern, the size and spread of which depends on the individual tool’s design. Airbrushes with fatter, stubby nozzles invariably produce a broader spray pattern, while those with long, slender nozzles emit a more ‘focused’ pattern. Round needle caps help to concentrate the emission of paint, reducing the amount of ‘overspray’, where loose particles of paint land outside the intended area. This is especially desirable when building up consistent layers of paint, such as on a locomotive livery. In contrast, crown-shaped needle caps permit working at closer quarters, without the risk of the air blowing back from the surface into the nozzle, thus creating a rougher inish, especially when painting ine lines or streaking e ects. A drawback of this design is that the air low is not channelled e ectively, leading to increased levels of ‘overspray’, especially when working further away from the subject (more than a few centimetres). Oval-shaped nozzles are o ered on certain airbrushes, allowing for a much wider spray pattern that is ideal for large-scale models or scenic work. Many airbrushes o er a choice of interchangeable needle caps and they’re often available as separate accessories.