Super08... I see what you mean about the covering. There are some wrinkles in the rudder and they do not want to shrink out. It seems to be a thick adhesive-backed plastic rather than heat shrink covering of some kind, although the manual says it can be heat shrunk.
Also.... Did you epoxy the wing halves together per the manual or leave them removable? Seems a shame to glue them together when they have such a nice tube and attach system.