Thanks for the reply Frank.

The configuration I'm removing was a tape of some sort on the flap to wing gap with conventional tape and mylar on the ailerons. All of this is bottom surface only. My concern is with the wing to flap angle and whether the mylar would get pinched or bent. Dick Johnson did report "Excellent factory-installed air seals were evident along the elevator, aileron, and flap hinge lines and at the flap/fuselage juncture," in his December 1981 review of the Ventus a in Soaring magazine. I'm not sure whether mylar was over the seal or not. The seals and mylar I'm removing are the GFS system from Streifeneder and have been on a long time.