Thanks, Charles.
For the fuselage, I used the airbrush freehand. For the wing, stab and elevator panels I was going to use the "clay snake" method you described, but wondered about any residue left by the clay. I decided to put some vinyl tape down first, then remembered that I had a roll of thick double stick picture hanging tape, so I used that. I sprayed at an angle to the (over) the tape and it left a nice slightly soft edge. Just what I was looking for.
Rick