Failing to seal standard cement-based grout leaves the porous joint lines unprotected against everyday spills, soap scum, oils, and moisture penetration. Unsealed grout will quickly absorb liquids, resulting in unsightly stains, discoloration, and a dingy appearance that resists normal cleaning efforts. More importantly, in wet environments like showers and kitchen backslashes, unsealed grout absorbs moisture consistently, fostering the growth of mold and mildew while accelerating the physical breakdown, cracking, and crumbling of the joint lines, which can eventually lead to water damage behind the tiles.
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