Here's a pic of one I did recently...
Attachment 222910
And here's the ticket as far as how to do it:
Attachment 222911
Completely finish sanding the scales to the final polished finish that you want ( I go to 12K grit) and then apply the pen to the letters. Be sure and get the fine point pen. After that let it dry over night and then lightly sand off the over paint with fine grit sand paper. Apply a second coat if necessary and then repeat the process.
Then with a fine point brush coat the letters with CA and when dry lightly sand with your final grits of sand paper. The buff the scales with polish.
Works really well ...and easy!