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Excessive moisture in grout can lead to mold growth and damage because moisture creates an ideal environment for mold spores to thrive. Grout is porous, and when it retains too much moisture, it can become a breeding ground for mold, which can not only affect the appearance of the grout but also lead to health issues and structural damage if left untreated. Mold can degrade the integrity of the grout over time, leading to cracks and discoloration. Furthermore, the presence of mold indicates that there is continuous moisture, which can compromise the underlying surfaces and materials, fostering deterioration.

In contrast, enhanced adhesion does not occur with excess moisture since too much water can weaken the bond. Faster drying times are associated with appropriate moisture levels; excessive moisture does the opposite, delaying the curing process. Lastly, while some moisture is necessary for a well-finished appearance, too much will create a poor look due to potential streaking or discoloration, thus not leading to an improvement in appearance.