I don't think anything will stand up to the steel-on-steel scraping that occurs on things like the door hinges of hood latches.

I use an ink pen, and will go through everything carefully during final assembly. Other areas like chassis bits that get marred by sheet aluminum I will touch up with a matte black spray paint. And then at some point I will ignore what I cannot see :-) Living in the Rockies, I don't have issues with corrosion. If I were in an area where salt was used on the roads or salt was in the air, I guess I would be more diligent - Hah!

BTW, I have touched up these brackets only to scrape them again with the next iteration of assemble-check-disassemble-rinse-lather-repeat :-)