Next, I plan to thoroughly scrub the entire underside using Scotch-Brite pads, scrub brushes, and plenty of degreaser. I’ll likely need to repeat this process a couple of times to ensure the undercarriage and inner frame rails are spotless (including the trans, transfer case, engine, etc.). Once it’s spotless, I’ll address any remaining surface rust with a wire brush, sandpaper, or steel wool. After another quick scrub, I’ll treat all rust spots with KBS Zinc Oxide converter, rinse everything again, and let it dry for a day or two.
Finally, I’ll apply Coreseal Rust Converter to all rust spots and raw metal, as well as the inside of the frame rails. Then, I'll paint the frame, suspension, and axles with black matte enamel.
I’ll tackle a few surface rust spots on the tub (there is just a couple)—sealing and painting them—then touch up areas where the undercoating has worn thin or come off.
Finally, I’ll clean up the skid plate, paint it, reinstall it, and, for the most part, be done with the work on the underside.
I might spray the inside of the frame and a few other areas with Fluid Film, though I’m still debating it since I’ve heard mixed reviews.
What are you'll's thoughts on Fluidfilm??