Single-stroke letters are the simplest style done with an airbrush. Each stroke that makes up a letter is done with a single pass of the airbrush. Embellishments can be added, and the thickness of the lines can be varied to some extent with the use of dagger strokes, but the letters are not built up in stages as with other lettering styles. Typical uses of single-stroke letters are simple script and spiky "rock 'n' roll" letters.
Double-stroke letters are built up using two or more strokes to form each segment of the letter form. The letters can be solid and of even thickness or expressive fonts that broaden and taper freely. This technique is especially useful for artists that have trouble with dagger strokes.
Block letters feature larger letters that are formed in outline and filled in. This may be the most versatile style of all. It can turn up on any item that provides enough space for the letters and the embellishments that block letters invite. Highlights, shading and drop shadows can add variety to this style. These letters also lend themselves well to gradated colors.
Balloon letters are constructed in a similar way to block lettering, but the shapes are more reminiscent of puffed up marshmallows, and the letters often overlap. This cartoony kind of lettering was the dominant style for T-shirt airbrushing from the early days onward.
Metallic letters simulate reflective surfaces such as chrome or gold. The effect is achieved through the juxtaposition of sharp contrasts, and shimmering gradations of warm and cool colors. This style is especially popular for lettering related to vehicles.