Embedding Materials
From ZBrush Info
You can paint different materials onto a 3D model using exactly the same techniques as polypainting. All you need to do is make sure that the M or MRGB button in the Draw Palette is on and then materials will be embedded in your model as you work. The materials can also be transferred to a texture map but remember that ZBrush materials will not work in other applications.
Alternatively, Projection Master allows you to paint materials onto a 3D model. Again, these will be transferred to your model in the same way as polypainting, or embedded in the texture.
To Learn About PolyPainting Click Here.
To Learn About Projection Master Click Here.
To Learn About Types of Materials Click Here.
