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A water-based, low- or no-VOC sealer is typically a good choice for marble countertops. Choose a sealant that is certified safe for contact with food when applying to kitchen countertops. For high-traffic areas, look for formulas that have heat-resistant and acid-resistant features. While there are economical and convenient spray-on sealers, they don’t coat the surface as effectively as the ones you apply with a pad or brush. 

White quartz countertops can yellow over time if exposed to sunlight. To prevent this, avoid installing white or light-colored quartz countertops in a kitchen with a lot of natural light, and never install quartz in an outdoor kitchen.

How often you need to reseal marble countertops depends on the quality and color of the stone, the traffic on the surface, and the type of sealant. Sealing at least once a year is the general rule of thumb. However, if your large family loves to cook or the countertops are in a busy family bathroom, you might have to reseal them every six months (or more). The surfaces of your rarely used guest bathroom might not need resealing for a few years.

Standing water can lead to surface discoloration if your granite countertops are improperly sealed. However, it’s possible to remove hard water stains with a baking soda paste. Take more care with acidic liquids, such as fruit juice or red wine, which can leave more permanent stains. That’s why it’s so important to reseal these surfaces regularly.