Have intact paint or apply fingernail polish on every bare spot. Frame save the insides of the tubes. Apply grease to all threads. I use marine trailer hub grease. Florida humidity isn't going to touch that stuff. Grease the seatpost. The quill of a quill stem. Any time you run across bare (non-stainless) steel, take your finger and rub marine grease on it. Sally Beauty has a decent selection of nail polish colors. Tammies Hobbies has good brushes and packages of 4 tiny glass jars perfect for mixing and saving. (I got very close to an early '80s Japanese metal flake with two polishes. Not a forever solution but easily renewable, easy to do and cheap. You can get clear also.

If you do these steps reasonably conscientiously, your bike will do fine.