Estes Vanguard Eagle, Kit # 2193, Part 8, Fin Masking

Here's a rare look through my patio door.

Scotch tape was set on the glass. To see the tape on the model, a wide point Sharpie line was drawn through the middle of the tape. The tape was cut down the middle of the line giving me two sharp, clean edges.
Don't press hard on the glass, you don't want to scratch it.

On the left is the mask for the lower fins on the plastic fin can. The Scotch tape was set on the fine line drawn earlier. Once again, this pen line idea was an experiment and didn't get good results. Masking tape was set down outside of that.

On the right are the upper fins on the BT-55 tube.

The leading edge of the upper fins were rounded. Look at the above right picture and you can see small pieces of Scotch tape placed around the leading edge.

On the left you can see small "corners" around the leading edge where the tape pieces were placed.
On the right the raised areas were pushed back with the flat side of my knife. I usually do this when the paint is still a bit sticky.