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@bigbadad
There is no point polishing before blasting - that will undo all your hard work.
The time the shine takes to degrade and the ultimate finish you will get depends on the alloy. No amount of polishing will shine up crap alloy well. I've just had some Japanese (motor) bike chaincases back from the polishers and they are crap compared to the finish acheived with good old British bike alloys..if you don't want a chrome look though you'll be fine.
Have you thought of powdercoat? I've used these guys loads of times and they offer loads of finishes - metalflake and chrome as well as straight colours... http://www.adeptindustrialfinishers.co.uk/index.html