Red Seal Tilesetter Practice Exam

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What is the purpose of a tile grout sealer?

To enhance the color of the grout
To protect grout from stains and moisture
To bond tiles to the substrate
To level the surface for tiling

The correct answer is: To protect grout from stains and moisture

The purpose of a tile grout sealer is to protect grout from stains and moisture. Grout, especially in areas that are exposed to water and dirt, can absorb liquids and become discolored or damaged over time. A sealer acts as a barrier, preventing these substances from penetrating the grout, which helps maintain its appearance and extends its lifespan. By sealing the grout, you not only keep it looking fresh but also reduce the risk of mold and mildew growth, which can occur in damp conditions. This protection is essential in areas such as kitchens and bathrooms where exposure to moisture is frequent. Enhancing the color of the grout is not the primary function of a grout sealer, although some sealers may impart a slight sheen. Bonding tiles to the substrate is the role of the adhesive or thin-set mortar rather than the grout sealer. Leveling the surface for tiling involves preparing the substrate before installation and is not related to the function of sealing grout.