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I bought boric acid on your suggestion, I’ve tried it once with my oxy-propane torch and I found it a bit gritty and as I’d chucked a tub of Sif flux in with my torch when I ordered it I’ve just been using that.
I want to give the boric acid another shot though. Just live with it not being as smooth a paste as Sif-flux or was I doing something wrong?
M_V
The boric acid? Just mix until its a paste, works as well as a 15 quid pot of cycle design. For silver the cycle design stuff is head and shoulders above the rest, but for brass imo it's wasted money.