good coat of primer then a few coats of spray paint, I like rustoleum. Ive had to touch the bottom up a few times so every once in a while hit it with some sand paper and spray a coat or two on if it gets scrapped
Your ideal paint would be something like por-15. That stuff is extremely though but the process of applying it is lengthy and expensive.
Unlike the previous poster, I dislike rustoleum. I've had too many issues with their coats chipping too easily. On my steering components, I've had good luck with dupicolor engine enamel from advance auto. It's held up the best out of anything I've tried. Obviously, anything that is going to be scrapping up against rocks will need touched up occasionally.
2x on the POR-15. I've driven one of my Trans Am through 7 years of Ohio winters, and the salt has yet to breach the POR-15 surface on the underbody & frame.
If I had to do it again, I'd go for this stuff by KBS.. Supposedly they are a POR-15 type of chemical and they have had great reviews. And they are much cheaper!
I was trying to figure out what to use on my TJ restoration and finally settled on this. The KBS and rustbullet seem to get pretty good reviews as well. I saw too many bad reviews from POR 15 to sway me away from it. A lot of people say its from not doing proper prep work but even people that used their whole process had adhesion problems and rust coming back through. If you research it you'll find that they took out most of the aluminum that gave it it's oxygen sealing properties whenever they changed it to black in color back in the day, it used to be silver too.
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