There are about 7~11 factory applied coats of finish on a pre-finished hardwood. The finished wear layers of pre-finished hardwood floors are far superior to any finish that can be applied during the construction of your new home, or the remodel of your existing home. Factory applied finish coats are more resistant to abrasion, and will not show swirl marks, hairs, dust, and other imperfections often associated with "from scratch" hardwood flooring. One of the disadvantages if the pre-finished hardwood is not supposed to be refinished and ones being scratched stays for good.