I just now saw you are in Australia. "Hobart Brothers" is owned by Illinois Tool Works who also owns Miller Welding so probably found at same welding suppliers. They make welding machines, supplies and a lot of welding filler metals. Brazing also. I found this contact on their website. Maybe Hobart isn't widely available in Australia, there is nothing on Amazon AU.
WELDING INDUSTRIES OF AUSTRALIA
5 Allan Street
Melrose Park 5039
, Australia
6(188) 276-6494
fuhai.liu@welding.com.au
My suggestion to try some is because the rods are not all the same. Obviously try it on some pot metal that is not rare or of value to see how you like it.
This stuff -
https://www.hobartwelders.com/consum...n-qty-7-770206.