Sorry guys, I can't find a pic...so lets start over:

When the ailerons are hinged on Robart type hinges AND the leading edge of the aileron is sanded ROUND, the 1/16" (or is it 1/32"?)plywood "extension" of the trailing edge of the wing overlaps the hinge-line gap (space). I hope this is clear(rer).

When you see a darker band in front of an aileron on a sheeted foam wing; that's the 1/16" flush plywood insert in the (1/8")balsa. In order to have the plywood flush with the balsa sheeting, one has to make a 1/16" groove (the width of the plywood stripe) in the surface of the wing (top AND bottom).

Lots of warbirds AND jets use this technique to "seal" the gap between a moving (control) surface and a fixed one.
A PICTURE IS WORTH 1 000 WORDS: but if you don't have one... :stupid: !

If someone knows what I'm refering to: please, please, post a pic!

SO I'm looking for a technique to do that.

THNX