Estes Maxi-Brute Honest John (Kit #1269), Part 15, Gluing Up & Sanding The Fin Sides

Before gluing up all the fin halves - 

Wait to read Step 16. I did a fin reinforcement to stiffen the plastic fins. 

This post shows how the fin sides are joined per the instructions.

The leading edge is already glued shut and remains closed in the following steps.

Slightly open up the gap on the root edge side a sneak in the brush to apply a wet line on both sides.

Close and hold until the glue sets up.

Where you can, open the two halves up enough to get the wet brush between the two fin halves.

Where you can't get the seam to open wide enough for the brush,

Brush on some glue over the closed edge. The glue is thin and some should seep into the joint.

After the glue dries, continue sanding using a block with 220 grit sandpaper.

Here I've started to sand down the overhang edge.

A joint has opened up - 

Brush on more glue and hold the gap closed. 

Don't sand all the way down and Don't remove every bit of the overhang lip.

Notice I traced a pencil line around the raised fin sides to better see the height of the overhang lip.

Sand very "close" the the fin side - 

Then sand and round off the remaining lip, shown on the right.

This leaves the fin a little stronger. If you were to sand to far, there is just two thin ends butted up against each other. Stopping a little early leaves a bit more contact of the plastic at the bonded sides.