Wiry, woolly, curly, and flat coat textures are not correct, and are to be penalized to the degree of severity.

BLUING / BLUE UP : Process of using blue dye to coat a surface of a master, gauge, or piece of product to check a flat, circular, or tapered surface.

This can make the flat become more flat. And you can easily find the defects exist in the ground so as to make level for the next coat construction.