Hangar 9 Alpha 40 ARF Assembly Manual page 42

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Step 4
Slide the remaining wing panel onto the wing tube.
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Step 5
As you slide the wing panels together, make sure the pin at
the back (trailing edge) of the wing slides into the hole of
the receiving wing panel. Slide the two wing panels tightly
together so there is no gap between the two.

Step 6
Use a paper towel and rubbing alcohol to remove any epoxy
that seeps from the joint between the two wing panels.

Step 7
Use tape (low-tack tape suggested) to keep the two wing
panels tight against each other until the epoxy is fully cured.

Step 8
After the epoxy has fully cured, use a covering iron to apply
the covering to the joint of the wing. Use the red covering
on the bottom of the wing, and the white covering on the
top of the wing.
Hangar 9 Alpha 40 ARF Assembly Manual