The method that works for me is a little different.

I glue the ail/Elev with Robart hinge points first. Then cover the bottom of the wing/elev creating your hinge gap seal as covering the first time. Takes a little more patience and practice but have never had problems with it. The design does skew just a little as the different colors are placed into the hinge gap but no one has noticed. Have done this with all sorts of planes including 40%, Pattern Sport, trainer etc etc.

Ed