The outside is sanded to remove the paint which as all gram-weenies know weighs .0002 grams and must be removed to lighten the load. Besides, if you're keeping the poptop on the can, you have to compensate somewhere.
LOL, Yes, I figured that out myself. YMMV on the weight of the paint.
Coosa <img src="/forums/images/graemlins/laugh.gif" alt="" />