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Have you found the brazing specific fluxes easier to use?
Massively.
I know boric acid powder is super cheap but I found it pretty horrible to use.
Sifflux powder a lot nicer to apply, can be stubborn to remove if you’ve overlooked it.
Using Cycle Design Low Fuming Bronze paste now. Dunno about low fuming, it seems to be the smokiest! But it’s so nice to apply and washes off really easily too.
I’m still using Sifflux powder for dipping the rod into as I didn’t seem to pick much up when I dipped it into the paste.
Awesome progress.
My printer died just as I started my new frame so most of my mitres have been by eye this time.
Only thing I’d question of your frame, are you using enough flux?