After a good brushing job, it's time to do a soft buff, but before you begin it's critical to take a good, long look at exactly how deep the brush marks are. They are probably only .0002 of an inch deep or less, so when you start with the buff, press down with less pressure. Be sure to use plenty of denatured alcohol to lubricate the buff and use a number three-micron diamond compound.  It's best to have the buff loaded (fully impregnated) with diamond compound before you begin because at this point the buff is far coarser than the finish and only by having a fully impregnated buff will the point of contact be finer than the polish. With a fully impregnated buff only the diamond is touching the surface and not the buff that's holding it.
Continue buffing until all of the brush marks have been replaced by the finest buffing finish you can get.                            

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