Meguiar’s® Deep Crystal® System Carnauba Wax creates a strong, protective barrier on your paint that locks in shine and gloss. Our long-lasting, tried-and-true formulation utilizes the highest grade of carnauba to protect all paint surfaces, including clear coats. |
Yes, carnuba waxes won't hurt on windows but they don't last very long on glass.
This wax is multi surface. It does not call out any exclusion for marble.