Hmmm
Hello,
How about starting with a layer of UHMW tape, then slather Tef-Gel over that? It's true that the tape won't hold up in places, but then there's the Gel in reserve. Also make very sure that you have at least one generous weep hole, and of course that there's no stray current down there...
As for the minor corrosion now present, get that metal as smooth as practicable first thing, to provide less landing for corrosion.
Fair leads,
Brion Toss
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