I practiced on some cheap reflectors first, and had an extra Mag C that I messed up too, Basicaly you shake up a can of Krylon Clear coat (I used Rustoleum Painters Touch) and lightly mist the paint from about a foot away, your goal is a clear coat that is not perfectly smooth, with the Painters Touch is looks different than DarkZeros, It appears more textured but still very shiny...I ended up with big globs of paint the fist time which significantly reduced the throw and brightness of the light.
The idea is to sputter jsut right, not too much or too little, both too much and too little will result in reduced brightness and throw..Maybe I can put up a picture later of ho wmine came out, and DZ has a bost in BST that shows his.