Andy Henderson wrote:
"Mylar would just peel off when trying this flap
psoition during your control checks."

Sorry, but I must disagree: my PIK 20B is sealed on the underside of the flaps with Mylar and Teflon, and they go down to 90 degrees! - the Mylar doesn't peel off, it works just fine if you put it on right. And if the grip of the mylar you have fitted to other places on the airframe is that tenuous you should be worried about it peeling.

Rgds,

Derrick Steed