Not exactly luck. Lots of rustproofing and replacement of the parts that did go rusty (a-pillars). Then I had the car taken down to bare metal and repainted.
I'm of two minds about working on it now. The oilspray means that there isn't a stuck or rusty bolt on the car (aside from exhaust manifold, can't be helped), but it's a mucky mess to work on sometimes.
Still, it's usually the shiniest track-only car at any given event I'm at