Undercarriage Paint

[sota]

I just hit the underside of mine with rustoleum with rust converter in it. I'll report in eventually as to how it's holding up.

 

[LibertyTC]

I use Tremclad Rust paint for touch ups.
The best thing I ever did when I first got Jeep, was to do a proper "Platinum Shield" Teflon type paint undercoating.

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Overall 8 years later, it has stood up very well.
One free touch up coming soon, once it warms up a bit...