Udo Rumpf wrote:
The edge of the Mylar tape .010" plus the edge tape .002" it
should not effect turbulent flow. A gap, covered by a sealing tape could.
The Mylar seal if it wipes it will seal. If you were to have
difficulties with this
a separate seal would be the way to go, as long as it does not interfere
with The Mylar.
Sometimes if the hinge is to close to the bottom surface it would be
difficult to get a wiping action
through all the motion of the flap and aileron.
I hope I understood your question.

Yes, it does answer my question. I suspect the best solution is that
used by Bob Fidler on his LAK, use Teflon tape to act as both a flow
seal and a wiping surface, then put a Mylar seal over it.

Thanks to all,
Marc