A little follow up, since I started this thread. I did end up picking up products from POR-15. I used the Metal Prep kit, then Rust Prevent Coating, then Top Coat on the dump truck. My truck is approaching four years old, yet is unused for the most part, and I have no intention of letting it look bad with age since it was such an expensive vehicle. So the issue was mainly that the dump bed undercarriage was not treated, just a light spray of black paint. The bed itself is stainless, and looks awesome. So I cleaned up all I could reach, which was a pain, but comparatively easy since I can just raise the bed for access. Three step process, finished in black, results are absolutely beautiful Chassis Black, and I'm sure I would not have ended up with such a nice job with Rustoleum topcoat. Now time will tell if I lasts, but it sure seems like it would from the results. The prime and paint were easy to use, dried fast, but not too fast, just enough time to settle out, with no brush strokes, nor runs. The only word of caution I'll give.... obviously standard rules apply for personal protection, but in addition, be very, very careful to keep the Rust Prevent Coating off your skin. It didn't cause any kind of reaction or anything, but when I finished applying it, no chance I could find anything to cut it... kero, gas, thinners, even acetone or pumice based cleaners, plumbers hand towels, not a damn thing would take the few spots and smears off my arm. I looked like a bum for a week. (understatement, I looked like a bum my whole life
).
Only weird thing, I picked up some Silver Top Coat to touch up the wheels. It was pudding. I used a bit of it with an artist brush, and it worked, and looked good, but it took way extra time to dry. I called POR-15, and they checked the last two batches samples, and said they were both thick. They sent me a replacement can and some solvent free of charge, which was nice. I haven't opened the can yet, but it doesn't shake, and I suspect that it may be the same. Anyone experience this??
Lefty71