Originally Posted by
Kennibear
You can get wet/dry sandpaper in VERY fine grits. I have 5000 grit (not a miss print, five thousand) and it is blue colored. I use it to polish epoxy that my wife casts and the epoxy is clear when done. Steel shines like a mirror. Usually I start no more coarse than 400 for really bad scratches and progress through 800, 2000 and then 5000. I use a wood dowel smaller than the hole and split with a saw to feed the paper in. I use a drill first but finish each grit by hand, going back and forth while rotating the hole. Any oil will work but I have five gallon pails of inactive sulfur and active sulfur cutting fluid so why not! Leaves a mirror shine and those scratches are not deep enough to materially change the sizing diameter.
Besides, larger diameter rarely hurts the group size.
KB
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