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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.

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.

Buffing will only remove scratches at the surface level of your flooring. You may also need to apply hardwood floor wax to restore the wax layer. To remove deeper scratches, you’ll need another floor repair method like sanding; however, if you sand the floor, you’ll also need to stain and seal it.

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.