The Materials Paintbrush is best used in 3D view. It lets you select a material or color in the catalog, then apply it to parts of an element. For example, if you want your table legs to be blue, you can select the Blue Paint material, then click on of the table’s legs. All table legs will update automatically. When you use the Materials Paintbrush on an element, the settings on the element’s Appearance property page update to match the selections you made with the Materials Paintbrush.
To use the Materials Paintbrush:
Select Edit
> Materials Paintbrush, or click the Materials Paintbrush button
on any tabbed toolbar.
In the catalog panel, select the material you want to apply. There is an incredible selection to choose from, including Wood, Brick, Marble, Concrete, Steel, Carpet, Tile, Roofing and Fabric. If you want to apply a solid color select something from the Paint category.
In 3D view, click on the element part that you want to apply the material to. The material is immediately applied.
Right-click and select Finish.