Some "0000" steel wool,or Krylon Mat Finish, or Krylon flat black spray paint, or flat lacquer, etc. There are many ways, you just have to do what your doing, experiment till something works for you. We have found the "0000" steel wool to be the handiest for cleaning up a finish, but that doesn't always work. Just got to play with it.
Welcome to The Grumble, do you have an actual name or is that it, Art Syfartsy? I had a customer once whose name was Passafume, that's the truth, I ain't making it up.
John