2.6 Materials Tab
From 3D-Coat Wiki
The Materials menu contains three channels: depth, diffuse and specular. On each channel you can put your own texture. By choosing a material and texture you will see the whole screen filled with this texture. You can add your own materials by choosing the “Folder” icon (material must be in format of BMP, DDS, JPEG or TGA). The “grey X” sign means no using of the material. Quick-access the “Materials” menu by pressing “M” key. Select any material from the list and have some drawing. All of the controls for masks, as detailed in that section, are exactly the same for both masks and materials alike.