Under carriage will be a combination of E-coat primer surfacer (bare shells are dipped into it at the factory) Pimer sealer and body color overspray on the floor pans that gets there from painting the rockers... Then theres the sound deadener sprayed into the rear wheel wells and other choice locations on the floor pan as well as undercoating (if your car was ordered with it new)...Just paint it black...Looks neater and its easey unless, you are doing a concourse 500 point restoration.
I started laughing, until I read the last sentence. I was headed toward the black thing anyway! Thanks!
Thanks Craig, Eastwood Chasis Black I have, from my mustang. I am going toward original on everything I can, that looks great.