We nitride pump housings for wear resistance, and strength improvement. Without secondary machining operations. Finished soft parts go in, wear resistant parts come out.
Does that sound like a cheap shotgun to anyone?

Here's a link to a decent, concise article, that shows most of the blank spots in this discussion. http://www.iaeng.org/publication/IMECS2011/IMECS2011_pp1244-1247.pdf

FWIW, Casenite(sp) changed it's formula a few years back to a "safer" mixture. Should a person have a can of their old formula, you could re-create the article above.

Out there doing it best I can.