Sanding the ball before a oil extraction was one of the original steps from the "Hot water & Dawn" oil extraction method. After they came up with the "Revivor" type ovens, it was still recommended to sand the ball first.
This was supposed to unblock the pores that may have been plugged up by impacted dirt and grime or polishes etc.
There are some that think it is a unnecessary step, that pores don't get blocked like that. But some feel your usually resurfacing at the time of a oil extraction, so why not.
IMO Sure sand it first, I'm usually resurfacing anyway. if there is anything blocking the pores cutting the top layer off would make it even easier for the oil to come out.
Does it need to be 500 grit? hard to say. But I would doing the sanding first (whatever grit you use) and de-oil it before applying any polishes.
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