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You don’t need to seal German smear; the mortar is already acting as a sealant for the bricks. You can seal the mortar, though, if you wish to further protect the area from stains, moisture, and dirt or make it easier to clean and maintain. Note that a sealant will make the mortar appear more glossy.

You can use some types of car wax to polish marble floors, as long as the polish is designed for use on marble floors. Read the label and test the polish on a small area of the floor first to see how it interacts with the marble. Car wax can help fill in or buff away small scratches, while polishing the marble for extra shine.

You can’t change the color of the stone, but you can update granite countertops without replacing them by painting them. Because granite is a porous material, you’ll want to seal them first before painting them so that the paint doesn’t hurt the surface. This is important because you don’t want to devalue your counters by damaging the original surface; even if you don’t like the color now, you or a new homeowner may want to remove the paint someday and return them to their original color. You can also cover them with 

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.