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In almost all cases, yes. Most grout is cement-based, meaning it’s highly porous and susceptible to mold, mildew, and grimy deposits. Grout sealer is a crucial step if you’re looking to preserve the look and structural integrity of these types of grout. However, some types of grout—such as epoxy-based grouts—are not porous and do not need to be sealed.

Bathroom mold tends to reappear due to the persistent presence of moisture and humidity, creating the ideal conditions for its growth. Since bathrooms are inherently humid environments, without proper ventilation, moisture accumulates on surfaces, providing a continuous food source for mold spores. Mold spores are present in the air and settle on damp surfaces to start growing rapidly. Additionally, if the underlying causes of mold, such as plumbing leaks or inadequate sealing, are not addressed, mold will return even after removal. To avoid recurring issues, addressing the root cause by improving ventilation, fixing leaks, and maintaining a dry bathroom environment through regular cleaning and maintenance is essential.

You should not use caulk as a direct substitute for grout, but it can be used as a temporary solution to fix minor cracks. Caulk is more flexible and doesn't dry as hard as grout, making it suitable as a supplement or for small repairs. To do this, first remove the old, cracked grout using a grout or rotary saw. Then, apply a matching caulk to fill the cracks, smooth it out, and let it cure. The curing time will vary, so follow the manufacturer's instructions; a full cure can take up to 48 hours.

Be sure to check the grout you use before you apply the grout sealer. Sometimes, grout doesn’t actually need sealer at all. 

For the rest, apply one thin coat, clean up any excess mess, and let it sit for at least a full day. After a day has passed, go ahead and apply a second thin coat. Again, let that dry for another 24 hours.