Ipedog, I used the Dupli-Color truckbed coating on my grill and am extremely happy with the results. It is very durable and has a flat finish to it. I figured i would rather spend 20 bucks to do it myself, if it works, awesome, i save about 100 bucks, if not... no biggie.
TIPS: 1) I used a full 2 cans on it.
2) scuff up the with like 100 grit.
3) try to apply it at 90* angles otherwise you get a VERY rough surface, I would suggest hanging it.
If you have any questions, let me know.