Paint for Frame, Underside, and Firewall.

After the wheel, hit the bad spots with a little hand sanding. Give everything you can reach an acetone wipe. I think you'll need about a dozen cans of the chassis black to really do it well. Have a helper shaking cans because as you lay it on the temperature will come down inside the can it'll start to spit and you'll need to switch to another one before the can is out and so forth. I highly suggest removing the wiring harness over painting over them if you want a professional look. Give a thought to using some other shades or brands of chassis or satin black on under hood areas. Everything in one tone while a car is assembled looks like a spray bomb job. For instance, use a different tone of the frame rails and the parts of the upper control arms you can reach. Heater box and wiper motor done separately. Master cylinder in cast iron paint.