On Sunday, June 18, 2017 at 4:24:15 PM UTC-4, Roy B. wrote:
My personal theory is that mylar seals were invented by the last guy who tried to take 20 year old white duct tape off of an open class glider wing. That's what we used to use on the underside in the old days . . .

Maybe they work. Maybe they don't. But they sure are easier to clean up.
ROY

Doesn't sound like you have had to take 15 year old transfer tape residue off very often!
UH