Blued barrell, threading

I have just had my blued barrell cut and threaded, what is the best product to re blue the thread?.

Wouldn't the blue wear off rather fast being on a thread. I'd say keep it clean and oiled but if you want to reblue it look for black magic or something along those lines. Think kleen bore makes it. Better the the paste casey makes imo

Cheers Toby

yea dont bother, just keep it lighly oiled