Dak attack!
Do not use Duplicolor Metalcast! I prepped it exactly as recommended by Duplicolor's hotline and it's chipping off at an ever increasing rate after only a few months. Ah well I knew that was a possibility before I started... it did look cool for a bit though:
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All Star
Yes. Just make sure it's prepped right. I had one for my 05 painted black at a friend's body shop. When my truck got scrapped over a year later it still looked like brand new and I've never heard a complaint from the member I sold it to so I assume it's still going strong. It's all in the prep.