You can paint a closed area on the model view or a closed area created by curves in NX Drafting as shown in the figure.

To paint a closed region in Drafting:
- Start the “Area Fill” command.
- Select a closed region selection method.
- Boundary Curves: Select curves of the closed boundary
- Point in Region: Click inside of the closed boundary. Curves will be selected automatically.
- Change the “Pattern Method” to “Solid Fill“.
- Change color.
- Click the “Ok” button to apply the color.