Might not be relevant(sp), but when I was visiting the US last summer, my buddy and I tried to mend the flaking of his Grand Cherokee with one of those products.
Well... first they have you rub the surface with this (sand)paper thingy and it just scratched the hell out of the surface...
Headlight restoration in what way?
Discoloration, chipping, hazing, reflector rusting, etc... (Not that I have any suggestions, but it would help, I imagine).
Just saw your sig. line and I'm assuming that it is for your rig, with 8"-ish round headlights?