Uhh just a minor invasion, thank you for asking
Yes as you've pointed out, rotary wire brushing is slow, I should have mentioned that. I've been doing my Weasel hull with it and it is indeed taking a while. I just do a square metre or two and then prime it. But for small items it's quite a reasonable sandblasting substitute which leaves the brushed surface nice and polished without pitting, and for thin panels there's no heat distortion.
Steve.