I'm attempting to polish my gas tanks, they are aluminum gas tanks and they are really ruff. The issue I'm running into right now is that these gas tanks have a ton a little grooves/scratches. I'm not sure why they are like this, maybe from manufacturing. I'm using a sisal buffing wheel and the brown bar and it's working, it's removing them slowly but at this rate it's going to take me forever. I'm wondering if there was something i could do to speed this process up a bit. I was thinking maybe a real fine piece of sand paper but wasn't sure. Here's a poor pic of the gas tanks, i also included a link that includes the huge version that will give you a bit better detail of the tanks
Giant Pic
http://reitanfamily.com/gallery/d/6363-3/IM000978.jpg