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Ok I need some help please. When I grind down my laps I will sometimes get marks from the sandpaper. Like the lap will turn yellow if I'm using a yellow backed sandpaper and it'll sometimes get red marks from a red backed. I've switched to a 40 grit grind pad and that is better but then I was grinding down the finboxes and then I got a black mark on the lam from the box. I am getting really frustrated by this happening. Its purely cosmetic but I am a perfectionist and want it to look perfect. Any help would be greatly appreciated! Thank you!