Duplicolor Rim Paint (graphite) is a Pain

Final follow-up: I did not purchase any higher-end products (doing this in Mexico). I did wet sand the rough until smooth in short order with 400 grit. I did not spray any more color coat (graphite). With the 1/2 can of matte clear (Duplicolor) I had leftover, I sprayed two more coats of clear after the wet sand and wiping down with wax & grease remover. The wheels now appear smooth, not grainy, and not very shiny due to the matte type clear, which is what I wanted. Just hope mounting the tires does not scratch the rims up too bad.

End of story (except I have two rallye rims left to do). And a collective thanks to those who took time to post here.