Model Tech Magic Formula 3D ARF Manual page 16

Mix and apply a generous amount of 30 minute epoxy to ONLY the top and bottom gluing surfaces of the stabilizer.
Push the stabilizer into place and realign it, double-checking all of your measurements once more before the epoxy sets up.
Quickly remove any excess epoxy and use T-Pins to hold the stabilizer in place and aligned until the epoxy has fully cured.
After the epoxy has fully cured, remove the T-Pins and masking tape and look closely at the glue joint. If there are any gaps
between the stabilizer and the fuselage, fill them using 30 minute epoxy for added strength. Again, before the epoxy sets up,
remove any excess epoxy, using a paper towel and rubbing alcohol.
STEP 3: ALIGNING AND MOUNTING THE VERTICAL STABILIZER
Remove the rudder and hinges from the vertical stabilizer and set them aside for now.
Push the vertical stabilizer down into the mounting slot. To align it properly, the trailing edge of the stabilizer should be even with
the back edge of the fuselage and the stabilizer should be pushed down firmly.
WARNING When cutting through the covering to remove it, cut with only enough pressure to cut through only the covering
itself. Cutting down into the balsa structure could weaken the stabilizer and cause it to fail during flight.
Mix and apply a generous amount of 30 minute epoxy to the gluing surfaces of both the vertical stabilizer and to the vertical
stabilizer mounting slot in the top of the fuselage.
Using a modeling knife, cut away and remove the covering material
from over the vertical stabilizer mounting slot in the top of the fuselage.
The slot is 6" long and 5/16" wide.
While holding the vertical stabilizer firmly in place, use a pencil to
draw a line on each side of the vertical stabilizer where it meets the top
of the fuselage.
Remove the vertical stabilizer and use a modeling knife to carefully
cut away and remove the covering material from below the lines you
drew. Remove the covering material from the base of the vertical
stabilizer, too.
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