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Pointers on polishing the hubs.. Not really, its a filthy job and you will have no finger tips left when you finish. It does look good though.
I used 80 grit and 120 grit flap wheels from bunnings. Followed by hand wet sanding with 120 up to 1200 wet and dry then polished with the polishing kits they also sell in bunnings. Look for a kit that comes with a sisal wheel and a loose cloth wheel with a bar of grey and a bar of white compound. I used them on the drill. If you have a dremel or similar that will help also.
To be honest i would probably paint them in hindsight. The POR15 i used has not sealed them properly. I think this was because there were pin holes in the casting. These pin holes have caused oxidation to form in some spots under the clear. Im not too concerned at the moment but will eventually strip the clear off and consider anodizing.
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