Hey I took your idea, and did mine as well. :)
They are 11 years old, and didn't look too good.
But I started with a 180 grit and took them down to the metal as best I could. Some spots were hard to sand, but I managed best I could. Then I took a 300 grit and smoothed it down nearly to perfection.
I then applied 2 coats of a high dollar primer, and then painted them black with 3 coats of an enamel spray paint. They look brand new.
But I ran into a slight problem.. apparently, the prime needed more than 30 minutes to dry and settle. The guy at the hardware assured me it would be enough time. Butt as I put them back on my truck, I noticed what appeared to be finger prints. But actually, I had moved or smooshed the primer. So, no I have to re-sand target areas and fix them up.
By the way 76_280.. what type of paint did you use and how long did you let them dry? The dude at the hardware told me 30 minutes for the primer and paint, but I think he was plain wrong.