....and onto the Core Support.
Again, I coated the Core Support first with the Rust Encapsulator and then the Underhood Black.
The Underhood Black lays out in a nice satin finish. It does not appear to have a porosity though so I'm thinking it will be pretty resistant to the "greasy fingerprint" that some flat/satin finishes are susceptible to. I did accidentally grab the core support with some oil on my hands. I was able to wipe the oil off with a bit of alcohol on a rag. No mark remained.
And in the following photos you can see the difference between the satin Underhood Black and the gloss Chassis Black.