Where on your truck will you be doing this? Is it just surface rust? For a cheap fix, sand or wire brush it down to metal and use some of the Rust-Oleum rusty metal primer (it's kind of a rusty red color on the cap), then put a coat of good paint over it, preferably Rust-Oleum as well. POR-15 works well too, but is more expensive. I think with a good coat of rust control paint you should be fine since Las Vegas probably doesn't have much of a problem with new rust forming. Wet sanding as far as I know is mainly for a nice shiny paint job and usually only done when you're painting an entire panel or other large area. It is done using water and some insanely high grit sandpaper, like 1200 or so. It just takes a small coat of paint off the top to sand out the imperfections and give it a shiny luster, much like polishing compound.
If it were me I'd just use the Rustoleum rattle can stuff. I painted the front part of the frame of my c20 with it under the engine and the core and rad support, and it has lasted all winter without any topcoat and without so much as starting to rust, and this is Indiana, so I'm sure you'll have good luck in dry ol' Vegas.
Good luck /forums/images/graemlins/grind.gif
