Estes Advanced Target Drone, Kit #1913, Build, Part 9, Gluing The Intakes

The outside edges of the intake shroud have been glued to the top rudder and underside ventral fin.

Notice how the slot edges over the long wings bow out. An arc has formed along the slot sides.

Use the flat edge of a ruler to press in and straighten out the slight arc.

Apply a slight amount of glue to start, not a full fillet.

Press the arc straight with the straightedge and remove. Check to see if the glue hasn't spread outside a fillet area. Remove any errant glue with a Q-tip. 

Here's a straighter slot edge with the first glue dried. Follow with a full glue fillet.