Never! One of the major upsides to quartz countertops is that they require no annual sealing, unlike granite. Once you have a quality quartz countertop installed, it’s good to go for dozens of years. All that’s required is minimal maintenance to keep its shine since quartz is naturally non-porous. This makes it stain resistant, though you will want to wipe up any spills on the countertop, as anything highly acidic can affect the resins and polymers in the stone countertops over time.