I used copic bleedproof paper and manga illustration paper
but I mostly used copic on hot pressed watercolor paper, to touch up my watercolor painting.
I found people applied darker layer of color such as blush or shadow first, then added (and blended with) lighter base color later.
Btw I rarely used copic mainly for my artwork because they are made of dyes, which means they are not lightfast, unlike artist watercolors which could last for century without fading.