Quote:
Originally Posted by kipps
Personally, I would go ahead and install the new exhaust now.
Once the truck is assembled, put it on a lift(ideally outdoors!) and powerwash the bottom side thoroughly. Use the most vicious turbo nozzle you can, and you'll dislodge a lot of the rust. Try to avoid hitting the wiring and any seals(oil-pan, etc) with the powerwasher at close range.
Once that's done, and the truck has dried out, spray it down with fluid film. Repeat the fluid film treatment every November. The fluid film is a wax/oil mixture that forms a gummy oily layer over everything. It's not permanent, and can be washed off if you need to service something. Fluid film does fine over light surface rust. It doesn't trap moisture in that rust like some other products do.
Do not use a rubberized undercoat! Those trap moisture and salt against the metal, and can frequently make the rusting issue worse. Rubber undercoating can theoretically work on perfectly clean metal, but the chances of getting your frame and components that clean are nil.
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X2. I prefer Boeshield T9, but same theory as fluid film.