fenderwell paint/coating

[rapidride3]

Okay here is the deal,,, i have a TOTALLY rust free 83' sierra. It has rust free fenderwells also. However the paint is really thin in places. My question is,,,,what is the best coating/paint for the fenderwells to be tough against salt,,,rocks,, and possible future rust. I am wanting a satin black color for an original look. I was thinking por15???? or powdercoating???? any other suggestions ????? I want to do something with them before i "lose them to cancer" P.S. I am also looking for something that will clean up easy/nicely with soap and water and a few swipes with a sponge. THANKS. Matt