Buy 4 new remanufactured wheels. Less than $150 each.

IMHO, not worth the effort to try and re-finish yourself.
Your result will never equal the finish on the remanufactured wheels.
Not to mention you will still have some road rash on the rims.

You can also get a set of 8 Hole 300E alloys from TireRack for 15 x 7 Silver
$99.00 each. I have had several sets.

Steve