Hi Mick, things are looking up as we could almost get an entire ozzie thread going here.
I have had no experience with Hydrofluoric acid but what I have read on the Net scares me. Hydrofluoric acid burn.
No F9 available in Australia, we don't have access to half the goodies that you guys do in the US.
I am afraid we have to put up with using Phosphoric or oxalic.
High John, we spoke on the phone a number of years ago.
Cheers
Greg