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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.

Seal grout annually, clean spills promptly, and use mild cleaners to prevent buildup.

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. 

Use pH-neutral cleaners specifically designed for stone surfaces to clean granite or marble. Avoid acidic or abrasive cleaners that can damage the sealant or the stone itself. Regular re-sealing helps protect the surface from stains and damage.