"Unfortunately it's only really ideal for thick castings of Aluminium on account of the heat and amperage required and the general mess it makes..."
Iv done quite a bit of work with ali stick rods. they are awful!! like really bad to use but we didnt use many amps it was about the same as u wud have with a normal 6013 rod. we were welding fillets in all positions on 3mm plate and some single v butts in channel.
when welding you cant see the pool for the slag so you kind of have to get a feel for them if you get what i mean? either way they are S***!!
I'll second what asmeix6g says, I haven't used ali sticks since the early eighties (thankfully), they have a mind of their own and are virtually uncontrollable, we used to use them for welding ali chequer plate decking in trailer floors.