Another technique for using the iron on covering is to bevel the stab and the leading edge of the control surface, the bevel is not from the center line, but goes fully across the face of the stab and control surface, this results in the hinge being on one side and give unrestricted movement. You then cover the side of the control surfaces that that the bevel goes towards, then you align the parts with the points of the bevel lined up, then iron on a solid piece over the stab/rudder or stab/ele, you get a solid hinge and no seams, works the same as a tape hinge but much neater.
My description of the process probably sounds more complicated than the actual procedure. I learned this technique from my Czech built ARF sailplane, and put it to practice when I had to "scratch" some new tailfeathers for my Slow-Stick.
Pete