Estes USS Enterprise #1275, Part 41, Painting The Impulse Engine Details

I'm not good at hand painting. This light gray impulse engine has straight lines and plenty of curves. I decided to mask and spray.

Here's the top - using many small piece of Sharpie marked Scotch tape.

The view from the bottom.

The thin mask border coverage is widened using brown tape.

Press a Q-tip around the edges to (hopefully) seal them.

A plastic grocery bag covered the rest.

After the tape was pulled - 

As expected, there was touchups.

The final look came out okay.