F-35 FrankenPanther spotted at Fort Worth

[Zaphod58]

Do they mix copper into the airframe, what is the green oxidation on the tail wing? Looks like mold

It's the primer coating under the paint. The vertical fins are coated in the RAM coat separately and are attached to the airframe already painted, but the aircraft has a primer coat under the coatings. You see it when panels are replaced, or in the case of the FrakenPanther on the entire front end.