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Granite should be resealed every 12 to 18 months, depending on the color and usage. Lighter granite needs to be resealed more frequently than darker colors. If you use acidic cleaners or prepare food on the surface regularly, you must reseal the surface more frequently. Without proper sealing, granite is vulnerable to staining. You can tell if your countertop needs to be resealed by placing a wet paper towel on the counter for 10 minutes. If the water beads up, it is still sufficiently sealed; if it sinks in, it’s time to apply sealant.

Most marble floors last at least 25 years, and they can last forever with proper care and maintenance. As a natural stone product, they have the edge when it comes to lasting longer than synthetic or softer materials, but they can become damaged. Grit and dirt that get ground into the surface will wear away the layers of stone over time, so cleaning and routine maintenance are necessary. In particular, regular sweeping and annual polishing and sealing will keep them looking beautiful and prevent wear and damage.

Routine sealing, avoiding heavy loads, and proper drainage improve lifespan. Regular inspections help catch and remedy problems early.

You generally cannot change the color of the natural stone, such as making granite countertops darker or lighter. Some people claim that certain chemicals will lighten or darken granite, but those will damage the stone and not provide uniform, expected results, so it’s better not to try. Similarly, some people ask whether they can stain over granite. Granite is beloved for its stain-resistant finish, so you probably won’t get the best outcome if you try to stain over granite to make it darker.

Instead, consider honing, painting, or applying another material over the top of the granite to make it appear darker.