One of the best aspects of Corian or any man made solid surface countertop material is the fact that it can be refinished. Scuffs, scratches and most stains are removed with a stepped sanding process. After refinishing, your countertop looks as good as it did the day it was installed. We have refinished countertops 20 plus years old and they look as good as new. Most of our customers have this service performed around year 5, but there is no set schedule as to when it should be done. Use of your kitchen and your personal preference really dictate the schedule.