Far as I can tell, someone wrote:
>I think I should give it a coat of wax. Like, the old fashioned
>paste wax we used on our cars. To protect the finish.
>
>What do you think?

No, the wax will come off with hot water and soap.

Prolly the porcelin is scratched from years of cleaning with Brillo or
just abrasion from pots and pans.

If you really like the sink, you might be able to get it re-coated, or
DIY with a kit.