While Marble is a very durable stone, when the finish is polished one must take care to prolong the finish. Standing water will cause the finish to fade. When using polished marble as a countertop you must be careful not to leave anything that might cause stains from rust, Chemicals, or food. Harm to the polish can also be caused by acidic food, that could etch the finish over time, and you should never use bleach, comet, or any acidic cleaners for they will have the same affect. Marble countertops will need to be sealed and resealed occasionally, and it is recommended that you consult your fabricator or builder for the best sealing product and timeline for sealing.