[Turtleman]

the lower the sheen the less imperfections you'll show..
depending on the coating material most will/can add the flatting agent to acquire any finish you want.
the higher the sheen the higher the solids you have on the finish.. if you want a low sheen finish but the high solids shoot the gloss then add a finish coat of clear to what ever reflective amount you want to deaden the sheen
I could write a book on the issue of powder or paint,, but thats your call.. its something I've been doing since 1967