On Jul 20, 5:53*pm, Brad wrote:
I've heard that on some sailplanes, putting a mylar gap seal on the
top surface can cause handling issues. Anyone care to comment on that?
I've added a mylar seal and the safety tape to the top of mine, and it
does indeed add a small step just ahead of the elevator, despite my
best attempts at hiding the fwd bump with safety tape.

Thanks,
Brad

The problem usually noted is when the safety tape or the seal comes
loose and acts like a spoiler, affecting elevator control.
It is unlikely, but not impossible for this to make the glider
uncontrollable.
Schleicher requires safety tape on elevator seals to avoid the problem
of seal lifting. Interestingly, they don't require it on flaps or
ailerons(this from '27 maint book).
That bump you have will likely act as a useful turbulator.
Commonly zig zag tape is put an inch or 2 ahead of the hinge line to
help retain flow attachment when deflected.
FWIW
UH