WATT AGE P-47 Thunderbolt EP ARF Assembly Instruction Manual page 9

IMPORTANT The wing joiner is cut in a shallow "V" shape. When you test-fit the wing joiner in the next procedure, make sure
that the "V" shape is toward the TOP of the wing panels.
If the wing joiner does not fit properly, use 220 grit sandpaper with a sanding block to lightly sand the wing joiner, until you are
satisfied with the fit.
While holding the two wing panels together firmly, make sure that the wing panels are lined up at both the leading and trailing
edges, then look carefully at the center-section joint: the wing panels should fit together tightly with few or no gaps in the joint.
IMPORTANT If the wing panels do not fit together properly, remove the wing joiner and lightly sand the edges and tips
of the wing joiner, until you are satisfied with the fit. Remember, when the wing panels are pushed together, there should be few
or no gaps in the center-section joint.
STEP 2: JOINING THE WING PANELS
Slide the wing joiner into the wing panel up to the centerline mark. Quickly remove any excess epoxy, using a paper towel and
rubbing alcohol, and allow the epoxy to set up before proceeding.
After the epoxy has set up, test-fit both wing panels together again to double-check that they still fit together properly. Check the
leading and trailing edges, too. It's important that they be even with each other.
Test-fit the wing joiner into each wing panel. It should slide easily
into each wing panel, up to the centerline you drew.
IMPORTANT When the wing joiner is installed, it should not fit
tightly into the wing panels. It should actually be slightly loose. This
will ensure that when you glue the wing joiner into place epoxy can
get into the joints between the wing joiner and the joiner box. This
will ensure the strongest joint possible.
Carefully slide both wing panels together with the wing joiner
temporarily installed (without using glue).
When satisfied with the fit and alignment, pull the wing panels apart
and remove the wing joiner.
Apply a strip of masking tape to the top and bottom edges of the root
rib on each wing panel.
The masking tape will prevent excess epoxy from getting onto the
wing panels when you join them.
Mix a generous amount of 5 minute epoxy. Working with only one
wing panel for now, apply a thin layer of epoxy inside the wing joiner box
and to only half of the wing joiner. Make sure to cover the top and
bottom, as well as the sides, and use enough epoxy to fill any gaps.
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