We installed a prefinished wood floor in our kitchen seven years ago.We had it refinished last year. The problem with wood in kitchens is the suseptability to damage by water. We found this to be the case with prefinished wood as the joints between the planks are magnets for moisture-related damage. The urethane finish never wore out, the floor looked terrible from the moisture damage! We had the floor sanded (because of the surface damage) and a three coat application of urethane applied. The natural color of the urethane was all that was needed to give the warm natural color we wanted (our floor is oak). The applications of urethane "sealed" the surface of the floor by bridging the edges of the planks. We are now very happy with the floor. We will never have a prefinished floor in our house again, opting instead to spend a little more initially and have an unfinished floor installed, urethaned to provide a protective monolithic surface.