I only did glue fillets where the root edges contact the body tube.
No wood glue will go on the adapter area. There is little chance of the low end of the fin making any contact with the ground or breaking off.
TIP: When applying glue for a fillet - (left side picture)
Squeeze the bottle to start the fillet, then stop squeezing and simply let the glue flow as you draw the nozzle down the root edge.
The right side picture shows the same glue line smoothed out.
Light sanding follows with some 400 grit. The outside of the glue fillets are usually rough and will need some smoothing.
A second white undercoat followed, with even lighter sanding with an older piece of 400 grit.
Notice the reflection on the flat side of the fin. I was just knocking down the tops of the slight orange peel.
I should have tied some Kevlar to the engine mount, but this engine mount had thinner cardstock rings.
The lower body tube section is a BT-50.
Some Kevlar was tied around a notched 20/50 centering ring.
This was pressed into place using the base of the 20/50 plastic adapter.
A glue fillet was applied around the top joint of the ring.
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