I did a 1940 half ton many years ago. I went over the frame with a variety of wire brushes in a die grinder. It's a good idea to wipe down any greasy or oily areas with solvent before and after the wire wheels are used. Once clean, I brushed on a coat of Eastwood rust converter. Next, I sprayed a coat of Eastwood Rust Encapsulator. I finished it off with a coat of Eastwood Chassis Black. I have no idea how this compares to other methods. I can only say that it's been over 10 years now, and no rust is showing anywhere. Note: Using wire wheels in a die grinder is not a real safe thing to do, and I imagine that the equipment manufacturers say to NOT do it. But, I do it anyway. It's very important to wear eye protection, and leather gloves help too. Those little wires come loose and become sharp little missles, along with rust chunks, rocks and lots of other stuff.
