Cnut, I'm thinking if you have any gunsmiths in the area they might be your best choice to inspect the coating first hand and see the process/finished product. Also on precision threads/areas they can be taped/plugged. It is most similar to powder coat. It is applied with hvlp guns and baked @ 350-400 degrees. I would think it would be ideal for your application. While I'm not an expert I can answer questions about cerakote.
R