The Rolls Razor; my journey with it

One doesn't need to duplicate the same grit as the "sandpaper" grits. Hence the lapping film only being listed in the finer grits. It picks up where the sandpaper stops. Or that's what I came up with back when I did that experimenting.

Yeah I understand that I'm simply asking if one is preferable to the other at the same grit.

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I don't remember. But yes there was a reason. Maybe cost? I think the polyester backing of the lapping films was more expensive.