He said its not oxidation that's a problem. It's the UV that destroys the paint that's the big issue.
Did some more searching and Eastwood seems to offer a Rat Rod flat black paint that's uv resistant and is supposed to last as long as a standard automotive paint. http://www.eastwood.com/rat-rod-flat-black-paint-kit.html
Should work for you but is not available for me since I'm in Ca where its not legal to sell.
Are you fitting those 255/85 tires without a lift? I tried to put a buddy's wheel with that size tire on my Monty a couple of weeks ago but it looked like they would rub when the wheel was turned. The wheel wouldn't fit without spacers so I wasn't actually able to get it on and try it out.
As for Sierra Expeditions, they've always had terrific customer service every time I've purchased stuff from them!
I can't wait to see your rig lifted. Remember to back off your control arm bolts and retighten everything including the lower strut mount bolt at curb height. You may tear up your bushings if you tighten them in the air.
Yup, waiting to see how it looks with the new arb suspension components.
Are you going to take careful before and after pics so we can see just how much extra lift (if any) you get from the upgrade?