It sounds like you have found Polishing compounds, most of us use these also but for polishing, they are not really good at cutting out rust and pitting... Many of us use Greaseless compounds from Formax for this in 80-120-180-320-400-600 then the polishing compounds

Look at this thread

http://straightrazorpalace.com/works...lustrated.html

I don't see why greaseless compounds would not be available even in SA just about any industry that polishes metal uses them...