I done mine awhile ago. Pretty easy to do. I used a drop sheet & masking tape to stop getting paint everywhere.
I used this product is spray pak. https://www.supercheapauto.com.au/search?q=caliper+paint&lang=en_AU
If your in the US, then there would be an equivalent brand.. I personally went for black, as I wanted the understated look.
This is my original post I put up. All the photos are on there