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I really like the film. I've never gone below 1 micron. The diamond film cuts very clean. The edge through a 10X loup always looks perfect with no halos along the edge that might reflect off burrs...

Nice razor.
You are correct about the lapping film. He likes to finish on 1 micron diamond lapping film (wet) on a granite reference plate. He also likes to use a thin sheet of paper as a cushion...