True, Denis....as soon as you hit the steel with the 180, it breaks down
to a finer grit real quick. The 180 is the standard de-glazing grit, although
it does sound course. Too fine a grit just clogs the paper, and won't leave
the proper scratches on the surface.

The scratches on the surface is what retains the oil when the ring is seating
to the cylinder wall. The "rough surface" of the scratches wears off immediately
as the ring is sealing....this is the intention. There has to be some wear
between the ring and the cylinder, and you want this "wear" to happen as
fast as possible. This "wear" is only one or two ten thousandths of an inch,
an imperceptible amount....not enough to measure. This is part of a normal
seating procedure. Most Guys freak out over the scratches, they simply don't
know the reason they are there, and just assume the surface should be shiny
and smooth.

If the ring does not seal, then it will glaze up again, and the compression
will never get to where it's supposed to be.

FBD.