I'd like to know myself why and how some defects are brought out or covered up. The billet parts I've had blemishes on, I stripped, resanded, prepped and etched to fix the problem. The parts I've had to rework are either glass beaded finish or highly polished. I can't remember one that had a finish that was in between the two. I haven't had to deal with a close dimensioned part with this problem. Probably because they are machined differently to aquire the dimensioning.
Just my thinking. The original anodizing covering of blemishes may be due to voltage anodizing and the higher CD that they run at.
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