On 3/31/2021 2:32 AM, krasw wrote:
Mylars do not seal the gap, to create airtight barrier you need that s-tape.

Right, mylar+teflon helps but does not seal completely on these gliders.
Its some decades back, but IIRC the rolling seal was an option,
and did help with performance (but a maintenance nuisance).
If you're working on seals anyway, consider adding the rolling seal if
not already equipped...
Hope that helps,
Best Regards, Dave