I have restored a cultured marble vanity in a home by sanding it like paint on a car. We used very fine paper in 3 grades, started with like an 800 or so and finished out with a 4k super fine. used water and a bit of a cleaner, ended up nearly new.
By adjusting the grit you can actually choose matte or shiny...
"In a democracy, dissent is an act of faith."
J. William Fulbright
Best ET-12.79 @ 111 mph
4340 pounds, Street tires
Just like we go to Publix