We often field questions such as the above, and/or how long will it last, does it work good against hard water? Although we often know the answer, we will still most likely contact the manufacturers rep just in case their has been either a change in the formula or because of a specific unique problem that is in the inquiry. This question was pretty straight forward and answered by the Flitz rep as follows. ” Yes, you can and it should last for up to 6 months. You can even used Flitz paste polish for more stubborn stains as long as the sink does not have a clear coat or lacquer finish.” If in doubt we always think it is best policy to contact the manufacturer of the sink and see what polish they recommend, especially if a warranty on an expensive sink is involved. You will often see Flitz Wax recommended. Don’t let the Wax word confuse you, it is a very good water based creamy cleaner good for removing fingerprints, makeup, hairspray, soap and lime deposits. You can buy a bottle of Flitz Wax + from our recommended online vendor or read more about it by clicking here.