As for powder coating, most all chrome powders will need a clear over them, as they are not uv stable. If they shoot a clear powder over it the chrome powder tends to milk out due to thickness of the clear. If they do chrome then shoot an automotive clear over it to retain chrome reflectivity. If you polish it, they can gloss clear over it. The chrome would be less work on your part. Knock thw casting off to smooth it then chrome powder it. Then auto clear over it. I done alot of cast AL parts in chrome powder.
This is chrome powder over raw AL casting. You can make out the casting some if you smoothed it a little, it would lay down better. My customer liked the look of chrome and didn’t care if it was the polished smooth look.
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I grinded, sanded and polished my LS3 front accessory drive. Some of the parts I clear coated and some parts I didnít. The parts that didnít get clear need to be polished about once a year but once they been polished once it doesnít take much to re-polisheben by hand. Since it is a rat rod it gets parked outside all year, if it was garaged I would think you would only have to touch up the polished stuff every two years.