This grout sealer is composed of silicon and seals your tileâ€™s grout for better water resistance. Whether youâ€™re considering your Lawn & Gardenâ€™s tiled birdbath or your shower, both need their grout protected from extreme moisture. This sealer provides excellent water protection and works against dirt penetration. Mold and mildew stains are not attractive in your bathroom or your birdbath. This easy-to-use silicon sealer will protect your grout from moisture damage inside and out.