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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. 

You can cut food on tough, scratch-resistant granite countertops. However, these hard surfaces can quickly dull your knife blades, and continual cutting in the same spot can eventually lead to marks forming and compromising the protective sealant. As with any countertop material, it’s always best to use a chopping board.

The frequency for sealing marble countertops depends on several factors, including the quality and color of the stone, the type of sealant used, and the amount of traffic the surface receives. Marble has a porous surface that requires sealing to maintain its shine and resist scratches. As a general rule, you should seal countertops at least once a year. However, for heavily used surfaces, like those in a busy kitchen or family bathroom, you may need to reseal them every three to six months. Conversely, countertops in a rarely used guest bathroom might only need resealing every few years.

Yes, you can repair a stone countertop yourself for minor issues like small chips or scratches, and DIY repair kits are available for this purpose. However, for larger problems such as major cracks or significant stains, DIY repairs may not be effective. In these cases, professional services are recommended to ensure a seamless finish, prevent further damage, and use the proper materials and techniques for a full restoration.