Polishing cast aluminum
I am about to polish aluminum for the first time. I purchased the necesary wheels and buffing/polishing bar (sisal, sprial sewn, loose sewn wheels, black, brown, and white rough bars) to polish my aluminum valve covers. The valve covers are casted aluminum. Do I have to sand them down with wet sand paper before I use my wheel with the black emery compound? What grit should I start and end with on the sanding? Thanks.
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