Good info Mattoo
A few comments from my asking questions for some time.
If you have applied oils, lanolin etc, then apply a tar/ epoxy/ skin type product later.. it is very difficult to remove, get those out of seams etc and causes long term issues with the new product seeping into gaps/ adhering.
Salt is not the only issue, sand/ irons sand that have been trapped, stuck up in seams, and such even harder with oils greases, cause mayor future issues.
So dont use inox, lanolins etc then get fully under sealed later.
And get under sealed before getting any sand/ salt trapped in seems etc
The whole issue is not a lot different to trailer care, except the chassis / bodies are usually epoxy galv dipped at assembly, rather than hot dipped galved.
Clean and clean again.
Regular respraying of oils lanolin and grease.
What I'm saying it's a misssion, it needs attention and it costs money and your time.
If you spend the money and time you'll get great results.
If you get slack, that salt water will slap you in the face.
It's an fn challenge.
It depends on your commitment, budget or attitude around your tools, or toys.
And not a truer comment could be made
PS Lanolin tends to come in arosol, good for mist spray under engine cowls, and mage up into body seams.
And comes in a pot..cant the constancy , now, my 5L pot gets rather hard even in summer..
I find digging about 3/4 of a med pickle jar out, top up with turps kero or similar...stab dedicated paint brush in to dissolve up heaps and have softer stuff stick to the brush. Then paint on generously, and it runs in to seams, etc very well
.
Been using for many yrs on my house , ungalved trailer, boat trailer with great success.
Quick easy, messy, very effective
If the turps soln is not too thick, can put in a pressure sprayer, with spray nozzle on extension, and spray up into drain holes, cavities, hard to reach places.
My got to after yrs of fisholene/ techcrial etc
But have not done the big horn yet because dont want to use this type of application that can have black sand stick to it up inside body seams.. then be trapped if decide to fully under seal.. plus adherence issues,