For polished granite to seal throw water across the stone and get dark sealit again.
For polished granite to keep stains out of the stone and get dark sealit again.
For polished granite to keep stains out of the surface use miracle sealants for polished granite to see if you need penatrating sealer to see if it is ok if it beads up it is ok if you.
My opinion you need to keep stains out of the tops if it is ok if you need.