Oh gee, sorry to hear that...such things have been kinda transparent to us so it`s easy to forget what others might be going through.
Ah, one of my favorite Detailing Topics
A sorta-short response follows:
I`m wondering how new/used it is...that`s gonna be the Big Factor.
That should work fine, it`s how I`ve done most of ours.
Go straight to the APC since this is apparently the first time you`ve done the underneath; don`t waste [resources] with a too-gentle approach. Have brushes and don`t-care-about-`em quality mitts/etc.
IME the easiest thing is to use KAIO for post-cleaning prep if you want to go that far. Similarly, I like to do a coat of Collinite 845 since it lasts a while and works on any surface (though I don`t let it dry of plastics, rather using a wipe-on-wipe-off method).
Then (or all by itself if you don`t bother with the above), maintain it with a SprayWax. I use Meg`s UQW most of the time.
THEN...it`s all about keeping it that way
That`s a whole `nother, involved topic! Hopefully you just won`t find any significant enough to require work. I sure hope you don`t need to resort to things like wire brushes (and I kinda lean towards grinding with a diamond burr rather than using the wire brush).
I`ve basically quit using Rust Converters (the one I really liked has been off the market for years) as other approaches have come such a long way recently.
To chemically treat rust I like Rust Bullet`s Metal Blast.
For the "Paint Over Rust" approach, rather than POR15 I prefer KBS Rust Seal, which works incredibly well for me. It`s not very UV-stable but that might not matter underneath.
You could go over that, or use by itself, Eastwood`s Black Heavy Duty Anti-Rust. It`s an undercoating that dries almost like a satin/matte black paint. Most importantly, it works well over *mild* existing rust.
I`ve been *VERY* pleased, i.e., more than just "satisfied" by far, with some pretty half-@$$ed approaches using the above products. Things stayed nice much longer than I`d ever expected when I did a not-usual Accumulator-level job on a rusty Blazer I had, and it stayed nice through its time with its next owner too. That one was 99% just "clean and spray the Eastwood Black HDA-R", never thought it`d work as well as it did!
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