You can use the Materials Paintbrush to quickly apply a different color or finish to any element.
To apply a material to an element:
Display your model in 3D, and make sure the element is visible in the view.
Select Edit
> Materials Paintbrush, or click the Materials Paintbrush button
on any tabbed toolbar.
In the catalog panel, select the color or material you want to apply. You can find an assortment of colors in the Paint category.
Click on the component you want to apply the material to. Materials are applied separately to the individual parts of the element.
When you are finished applying materials, right-click and select Finish.