Oh Lordy, I now own a Fordy (a Lincoln actually)..

[njsteve]

And after the pressure washing, wire brushing and cleaning, they applied the black wool wax. The stuff is a non-petroleum metal preservative. I think it is Lanolin based. They have clear and black. It lasts about two years and then needs to be reapplied. It's mostly for daily drivers in the rust belt areas, but it soaks into the metal and keeps it rust free. The only caveat is having to wear gloves if you are doing anything under the car. That, and waiting a few weeks for it to harden/soak into the underside original undercoating and metal.

BTW, these guys did the frame repair on my 1995 Suburban three years ago. The common rust area in the OBS 4WD truck frames are the sides of the front engine cradle near the steering box, that have no water drain holes. They did an amazing job on the truck so I had them schedule me for the Lincoln, too.

While the Lincoln was there they also had a Pontiac Aztek that they were repairing the unibody frame rails on...and at least a half dozen FJ Toyotas in the staging lanes for repairs. One of them was driven up from Florida for the work. Check out their facebook page and you can see the work they do. Amazing stuff!