I know little about these really (the plasma cutter that is, not car bodies) so here goes.... I currently use discs to chop out old rusty metal before replacing with new, but could the draper plasma cutter replace discs? I'm mindful of the sales blurb that says the metal should be conductive - if I've got to grind back the rust (or paint) in order to cut it, its probably not worth considering cheap plasma? What do people think. Cheers. Joe