Well, I did mine about 6 years ago and lay tools and parts on it all the time, so it's a little worn. I was actually planning on giving it a couple more coats in the next week or two. Here's a pic a couple years after I did it.
I washed it well, and then went over it with some rubbing compound. I didn't put any sort of clear coat on it as I wanted it as flat as I could. I paid about $6 or $7 for two cans of spray paint at the local Ace. I had some on hand but if I'd needed masking tape the total would have been about $10. I may removed the bonnet when I recoat it because last time I wasn't paying attention and a couple of drips feel off the spray nozzle. Oh and I masked along the conture of the ridge on the bonnet.
It's not everyone's cup of tea, but for lees than $10 and about an hour's work, I'm satisfied.
Someone out there probably has a better pic of theirs.