Imron might never fade on a Jeep. It's the most durable paint you can put on it, and it is a bit pricey, but check Ebay....I've found it pretty inexpensive there.
And honestly, at my local paint supplier, Imron is a bit less than the Dupont Basecoat/clear coat in the same amount.
You can find cheap base/clear, for sure, but you get what you pay for.
I'm not putting Duplicolor or Summit Racing paint on mine, though.
I can tell you some stories about Imron's toughness. It'll withstand brake fluid. Seen it.
Forget sanding and buffing it unless you do it in the first few days. It's literally almost as hard as a rock. Doesn't need wax. Impervious to acid rain. Easy to spray.
If you use it, you need a REALLY good respirator....it is VERY bad for you to breathe.