That's a good tip. I only fluxed the area intended but a cheeky bead ran down the barrel with some flux along for the ride and I got a blob and smear half way around the barrel. Probably exacerbated by the barrel being spotlessly clean and oil free, so perfect for solder adhering!
Wasn't hard to clean up just very hard to see if I got it all until I started the rust blue process.
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