I found I prefer the look of the standard Van?s channel. I do however put a few dabs of black RTV in the channel, then install the wing gap seal before the RTV sets up.
Once I figured this out the gap seal has been trouble free - and it easily comes off and back on the plane staying attached to the aluminum gap seal.
Hint - for you RV-10 builders out there use this rubber channel on the leading edge of the wing to fuselage intersection instead of nothing like the plans call out.
Carl