As I previously wrote, I found a genuine GM factory fin for my 87' GTA. I am very very excited because my old fin that came on my car when I bought in 87' went extremely bad with rusting, and now I find a new fin that has no rusting or cracking. My big question is, is there anything I can do to this fin to prevent it from going bad like the first one? I keep car inside unless I am taking out on summer nights. So car is not in weathers. I don't drive in rain. And I never put hose on car, I give spoung bath only once a week during summer time. Please let me know if anyone knows how to preserve fin from rusting. Thank you

Yumiko