Kind of on topic here, this is my Lew's Super Duty on its 5th year in the salt.
The spool bearings are rust-resistant, unshielded, and low-inertia (Air ceramic HD).
I always use unshielded spool bearings, at least partly because shielded bearings retain salt just like they retain lube - that also gets me inside more often to flush and lube spool bearings.
The other thing you gain with these bearings is your spool is faster out of the gate without overshoot, and that equals extra distance. You get equivalent brake result using less brake, and that equals extra distance.
Note my palm-plate brake magnets need replacing - four magnets are showing filliform corrosion lifting the surface plating...
...ordered replacement magnets from AMO Store on Ali Express...
that magnet went right in the garbage after this photo.
Another thing about reels in salt - remove/replace parts showing any signs of rust. The salt rust itself is more corrosive than the salt, and you don't want it spreading through your reel.
Note on spinning reels and all drive bearings, you need shielded bearings to retain lube, even if that retains salt.
Absolute best approach with onset of salt rust - replace them.