[MJN]

I've had great experiences with Rust Veto 342
https://www.cosmolinedirect.com/cosm...SADEgLImfD_BwE

and AMSOIL HD Metal Protector
https://www.amsoil.com/p/heavy-duty-...otector-amhsc/

Both are great for getting up into cavities, drain holes, filling seams, etc and leave a heavy wax coatings that repels salt, brine and prevents water from sitting in pockets. The AMSOIL goes a bit farther than Rust Veto and doesn't have as strong of an odor.