Never had a problem with egdes coming up, in decades of using Monokote, if the edges are sealed by enough heat and pressure. The iron should be hot enough to change (darken) the color of the Monokote, temporarily, as it is being applied. Some sealing irons DON'T GET HOT ENOUGH! Pressure can be applied by rubbing with a cotton 'rag' immediately following the hot enough iron. Also have used, for the same decades, Windex and other brands of window cleaners (even home mixed) containing amonia.

It is also a good idea to apply the Monokote with the lapped edges trailing when possible. Like starting from the rear/trailing edge working forward and apply the next color over that leading edge and so forth. I've applied many Monokote edges on fuselage sides, trim colors, etc. without peeling problems though. A lot of my planes have the different colors of the top and bottom surfaces meeting (one overlapping slightly) at the leading edge of the wing.

Terry in LP