Estes Python 4 Build, Part 8 Fin Fitting and Fillets

Before spraying on any filler/primer:
This strips of masking tape were pushed into the fin slots and against the root edge gluing areas.
I didn't want to get any primer where the fin root edge would glue.

The primer filler was sanded down first with 220 grit.
The side of you thumb acts like a cushion and fits the round tube well.
The 220 grit removes most of the gray primer. Sanded just until you start to see the white tube.
Then switch over to 400 grit to smooth it all out.

The first fin fit wasn't good.
The root edge needed a narrow notch for the Mylar engine hook ring underneath.

Fit each fin in it's own slot.
Mark the first fin and it's slot with a "1".
All the fins will fit differently so keep track of their positions as you adjust the root edges for the best fit.

The opened tail cone slots were wider than the 3/32" thick fins.
Titebond M&TG was used to fill the open slots on either sides of the fins.
The Molding and Trim Glue worked well and didn't show any bubbles after it dried.