Crosshatching refers to the distinct pattern after finishing metal. Most commonly, in the cylinder bores of an engine (using a ball hone to achieve the actual crosshatch pattern). In that instance, the crosshatching is used to help better seal the rings in the cylinder.
Sorry the picture is so big, but at least you can clearly see the crosshatch pattern.
A new or resurfaced flywheel may have this same pattern due to the way it was finished or lathed. This is a very thin finish.... Not going to have any positive effects, as it will be worn away fairly quickly.