ajwilson20
Oakley Enthusiast
You can be pretty aggressive with the aluminium and still have it look nice. You can sand deep scratches away with various grades of sandpaper and then some finer wet and dry paper until its very smooth. As for keeping the grain you can do some vertical strokes with the fine sandpaper and then use some metal polish on a scotch pad / kitchen scouring pad and do up and down strokes and this will soften the lines and leave a dull polished grained appearance.