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No, using a power sander on brick is not recommended because the force of the sander can destroy brick's fragile outer layer. Even using sandpaper on brick is discouraged because of the damage its abrasiveness can cause.

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.

DIY is possible for small areas. Professional services provide deep cleaning and a polished finish for larger spaces.

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.