Hangar 9 Ultra Stick 40 ARF Assembly Manual page 11

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Step 2
Mark a center line on the joiner. It should slide into each wing
panel up to the line. If not, lightly sand the joiner so it fits
correctly.
Hangar 9 Ultra Stick 40 ARF Assembly Manual

Step 3
Use 30-minute epoxy to glue the joiner into the wing panels.
Apply epoxy in the joiner pocket and all sides of the joiner,
including the top and bottom edges. Also coat the exposed
wood on the root rib with epoxy. Start with one panel, insert
the joiner, then the opposite panel.
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