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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?
This makes me nervous. Do you use something fancier?
Mix until an even paste or specific ratio?
Much appreciated on the Manual borrowing. Any other old bits and bobs, tools, fixtures, scraps etc that you won't use, I may be happy to buy off you if you come across anything in the future.