The airbrush is a magical brush that reaches its full potential when used in combination with the Slate. It is a 3D paint spray than can help colourizing a large surface without touching your paper for example.
Hover with your pen over the Slate's surface. The higher you are, the larger the spray area will be, indicated by the diameter of the cursor. Then simply push on "S" on your keyboard to begin spraying and release the button when you want to stop.

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