Aluminum Surface prep

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    I have some large rough cast aluminum engine (air cond. & power steering) brackets of irregular shape. The surface is too rough to buff. My buffer runs to fast for an expander wheel. Should I use sandpaper or emery cloth (by hand) to prep. the surface? Am I correct in thinking that I need to finish with 400 grit. I assume this is preferable to using a sisal wheel and emery compound. Thank You!

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