How to seal grout (and when you do not need to)

Grout is the part of a tile job that shows dirt first. Sealing cement-based grout slows stains and makes cleaning easier.

Does your grout need sealing?

Cement-based grout is porous and benefits from sealing. Epoxy grout and many modern high-performance grouts are stain-resistant and do not need sealer. Check the product used on your job.

When to seal

Let new grout cure fully as the manufacturer directs before sealing. After that, the water drop test tells you: if a drop soaks in and darkens the grout, it is time.

How to seal

• Clean the grout and let it dry completely.
• Apply a penetrating grout sealer with a small brush or applicator bottle, just on the grout lines.
• Wipe any sealer off the tile face before it dries.
• Let it cure before the shower gets wet.

Keeping it clean

Use pH-neutral cleaners; harsh acids and bleach wear down sealer. A darker grout color hides wear in busy areas; see the grout color guide.

Better grout from the start

In showers and kitchens, we often recommend high-performance or epoxy grout. See custom tile showers and tile.

Common questions

Do I need to seal grout?

Cement-based grout benefits from sealing. Epoxy and many high-performance grouts do not need it.

How often should grout be sealed?

When the water drop test shows water soaking in, often every year or two in wet areas.

How long after grouting can I seal?

After the grout has fully cured per the manufacturer, commonly a few days.