All my trucks get Line-X. Because I don't keep them but a year or two I don't know the longevity.
Pep Boys sells Hercu-liner, in colors, for DIY.
I was happy with it.
Also use it to coat the bottom of horse troughs, to protect from rust due to ground contact. First trough I coated was 10 years ago. It was almost rusted through, when i coated it. It is still in use.
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