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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. 

Yes, limestone often turns yellow over time when improperly cared for. The stone contains natural iron deposits, which can oxidize when exposed to water, acids, or harsh chemicals, such as bleach. Without exposure to water or chemicals, limestone should not turn yellow. Always seal limestone countertops to protect them from moisture, and only use gentle cleansers designed for stone.

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.

DIY repairs can address minor issues like small scratches but may not effectively fix larger problems like major cracks or stains. Professional repair ensures proper materials and techniques are used to restore the countertop fully.