Oldfart
FRF Addict
I've had great luck with Rustoleum Rust Reformer spray paint to get your truck looking good again underneath. It comes in black, just clean things up as well as you can, then spray it black. I hand sanded off the rust I could get to. I did my axles and some other small pieces underneath that looked crappy as soon as I got my truck last year. I spent about an hour prepping and cleaning it up and then sprayed it. It still looks really good. It's SO easy, because it's already black.
Rust-Oleum Stops Rust 10.25 oz. Rust Reformer Spray Paint 215215 - The Home Depot
The Rust-Oleum 10.25 oz. Rust Reformer Spray is designed to convert rust into a non-rusting surface. For use on rusted metal only, the corrosion-resistant spray is compatible with most solvent and oil-based
www.homedepot.com