We independently research, test, review, and recommend the best products—learn more about our process. If you buy something through our links, we may earn a commission.
Applied annually–or even every six months if the tile often gets wet–you can lock moisture out of grout, keeping it looking its best far longer.
We evaluated grout sealers based on effectiveness, longevity, ease of application, and versatility. Our top choice, Aqua Mix Sealer's Choice Gold, protects and seals not just grout, but also most types of tile and stone, to keep your counters, floors, or surrounds looking their best.
Here, the best grout sealers on the market.
Best Overall: Aqua Mix Sealer's Choice Gold Quart
Safe for most types of stone, ceramic tile, and grout
No-sheen, non-slippery finish
Safe in food-prep areas
Very few complaints of white haze
Who else recommends it? Bob Vila also picked Aqua Mix Sealer's Choice Gold Quart.
What do buyers say? 91% of 1,000+ Amazon reviewers rated this product 4 stars or above.
Grout is both decorative and protective, and acts as a filler to cover any space between tiles to form a solid surface. Since grout contains a portion of sand, it needs protection from a sealant to last, as otherwise moisture and regular use wears the grout away. Also, sand is porous, having small holes where dirt and mold spores can remain. The best sealers block these holes as much as possible to help prevent the buildup of mildew, which stains grout gray or black.
The Aqua Mix Sealer's Choice Gold Quart takes the top spot for its natural looks and extensive protection. This product is a water-based sealer that provides ample protection over the entire surface, including grout and tiles. It also dries with a no-sheen finish for a natural, non-slippery look and feel. For ceramic tiles, this will provide additional protection against staining and wear, and it can be used with stones such as granite, marble, masonry, and limestone. Use this as a pre-grout sealer on your tiles for extra protection in areas such as bathrooms or kitchens.
Best Budget: Black Diamond Stoneworks Ultimate Grout Sealer
Fights mold and mildew growth
Some complaints of bleaching of colored grout
Not all budget grout sealers do a good job of protecting the grout from dirt, mildew, and other stains. So while an inexpensive option is a good choice for larger projects or for tighter budgets, you still need to be sure the sealer gets the job done. The Black Diamond UGS PT Ultimate is the best choice for this, since it’s meant to resist even tough stains from coffee, wine, and oil, yet it won't break your budget.
The sealer is designed to repel oil and water, which can lead to extensive damage in the grout over time. In places where moisture is common, such as the kitchen or bathroom, this type of protection can reduce the amount of maintenance your grout and tiles will need after extensive use. The sealer helps repel food, grease, mildew, as well as mold to prevent ugly stains and damage from developing.
Best Impregnator: Miracle Sealants 511 Impregnator Sealer
Won't alter the color or appearance of the treated surface
Suited for use on most types of stone, tile, and grout
Excellent protection against stains and water damage
Some complaints about odor
The challenge with grout sealers is depth. Since sand is porous, deeper holes need to be addressed depending on the thickness of the grout. But most sealers use a water-based solution that doesn't penetrate much below the surface. This leaves the deepest portion of the grout unprotected. To reach further in, an impregnator like the Miracle Sealants 32-ounce bottle is necessary.
This sealer uses a solvent-based formula that penetrates deeper into the grout layer than similar water-based products. The deeper penetration means extra, longer-lasting protection for the grout and surrounding tiles. The sealer dries into a slip-resistant finish, so it is safe to walk on treated tile floors without worry. The extra protection will also keep stains from forming, preserving the look of the tile surface.
Formulated for both interior and exterior use, you can also use this sealer to protect outdoor tiled surfaces on patios or around swimming pools.
Best Spray-on: Miracle Sealants 511 Spray-On Grout Sealer
Easy to use
Effectively repels stains and moisture
Only for grout, not other surfaces
Can create haze on nearby stone or tile surfaces if not applied carefully
Applying grout sealant can be a tricky process depending on the method of application. Canned or bottled sealers require extra time and attention, along with a tool, sponge or rag, to create a solid, even layer. Spray-on sealers are a great alternative since it is easier and faster to get a level and complete finish over the grout and other surfaces.
The Miracle Sealants 15-ounce spray bottle uses a consistent pressure spray for equal coverage on the surface. The formula can be applied to grout, concrete, brick, and other natural stones (should you want to have a single protective layer over the surface as well). For floors, you can use the spray inside and out since it will resist the common moisture levels found in outdoor environments. The product resists stains and damage from oil and moisture, and doesn't change the appearance or color of the underlying grout.
Best Tube: Miracle Sealants Grout Sealer
Easy to apply
Only for small areas
Some complaints about difficulty squeezing sealer out of the tube
Tube grout sealers allow for precise control over the sealant as you work without need of a brush or rag. But since tubes usually don't contain a whole lot of product, they are best used for small projects or for touching up damaged spots. If you have grout, it's smart to keep a tube of sealant, like the Miracle Sealants Grout Sealer, on hand for spot repairs when needed. This helps to keep the grout intact over time.
The brush-topped tube contains 6 ounces of sealant, which should last a long time for the occasional touch-up or repair. Once fully dried, the sealer will resist mildew and stain build-up, making cleanup in bathrooms and kitchens easier and safer. The sealant also provides stain protection on tiles. It's a quick and easy way to tackle grout maintenance.
Best Multipurpose: Black Diamond Stoneworks Granite Sealer
Suited to most types of stone
Safe for use in food-prep areas
Some complaints about haze on granite
Few complaints that directions are not clearly written
Sealant formulas vary depending on the brand and manufacturer. Some formulas are specifically for grout and nothing else. But if you want to seal grout on a large stone surface, such as a granite countertop or marble floor, a multipurpose sealant like the Black Diamond Granite Sealer may be a good alternative. It's quick and easy to apply and dries within just a few hours.
The spray-on sealer is water-based and non-corrosive, making it safe for granite, concrete, and most stone surfaces in addition to grout. The effective formula repels even tough stains from wine, oil, ink, and coffee, making it a great choice for kitchen counters and other dining surfaces.
Best for Large Jobs: StoneTech Heavy Duty Grout Sealer
Suitable for use on both sanded and unsanded grout
Effectively resists oils, stains, and moisture
Few complaints about darkening of grout
Large stretches of grouted tile naturally require more sealer to get a thick, even coat and deep penetration. Gallon sealer bottles are the most cost-effective way to purchase sealer for big projects. With a gallon bottle, you will have enough to finish larger projects up to 1,000 square feet, and you might even have some left over. You can then store the additional sealer for later touch-ups.
StoneTech Heavy Duty Grout Sealer is a multipurpose sealant formula designed for both sanded and unsanded grout used with natural stone, porcelain, and ceramic tile. It’s formulated to provide the utmost protection against both water-based and oil-based stains, maintaining the good looks of your countertops, floors, or shower surrounds, and warding off ugly black spots, mildew growth, and other imperfections for months at a time.
Aqua Mix Sealer's Choice Gold (view at Amazon) takes our top spot thanks to its no-sheen, natural appearance, suitability for use over many types of natural stone and tile as well as grout, and superior protection against moisture and staining. But if price is a major concern, turn instead to Black Diamond Grout Sealer (view at Amazon). This product is only for sealing grout—it won’t help protect your tile or stone surfaces—but it’s easy to use and does protect white or colored grout from moisture and oil.
What to Look for in a Grout Sealer
Grout sealer is available in spray-on formulas, ready-to-apply tubes, or larger quart and gallon size containers that require rag or sponge application. Take your pick of how you’d like to apply a sealant to your grout, keeping in mind the square footage you need to cover. While a tube of grout sealer is convenient, it probably isn’t a practical choice for larger jobs. Spray-on formulas help achieve a consistent, even layer of sealant over the surface, but gallon-size containers will offer the most bang for your buck.
Water vs. Solvent Based
Some grout sealers are water-based formulas, while others are solvent-based. Water-based grout sealers offer more surface-level protection and won’t penetrate as deeply into porous grout, but they also don’t produce as many odors or VOC’s as some solvent-based formulas. For deep protection of your grout, however, a solvent-based impregnator-sealer is the best bet since it’ll fill spaces and protect your grout from deep within.
While some grout sealers are intended for grout only, other formulas can be used on cement, granite, and other types of natural stone. Look for a non-corrosive formula to ensure that it won’t damage your treated surface. And if you plan to use it on a food prep or dining surface, like kitchen counters or a bar top, then look for a product that's labeled as safe for contact with food.
How do you apply grout sealer?
While applying grout sealer isn’t difficult, it can be a bit tedious if you have a large area to cover. Still, it shouldn’t take more than a couple of hours at most to finish the task. Always read the specific product application directions before applying sealer, but as a general guideline this is how the job is done.
- If the grout is new, wait at least 48 hours—72 is better—before applying grout sealer. This gives the fresh grout enough time to dry completely. Otherwise, you could get cloudy or bubbled results.
- If sealing old grout, be sure it’s as clean as possible before resealing it. Otherwise, you’ll trap dirt and stains beneath the sealer.
- Apply painter’s tape to block off and protect any trim, such as baseboards, that you don’t want to wet with the grout sealer.
- Choose your appropriate application tools. If applying the sealer to a large tiled floor, and using a product safe for use on tile as well as grout, it’s fastest to apply the sealer with a sponge mop. But for most jobs, you’ll do best with a small foam paint brush, sponge, or roller. Some products come in applicator bottles with a roller top built right in; this is especially handy for thin grout lines. Aerosol products spray on directly.
- Wet your applicator with the grout sealer, and begin wiping the liquid into the grout lines. If you are sealing both horizontal and vertical surfaces, start with the vertical tile.
- Apply enough grout sealer to soak the grout. Work slowly and methodically to ensure you evenly coat all grout surfaces.
- Wipe excess sealer off the tiles, unless you are using a product meant to seal both grout and tile.
- Let the sealer dry for the time recommended by the manufacturer. This is typically anywhere from 15 minutes to an hour.
- Apply a second coat of grout sealer, following the same general guidelines.
- If the sealer leaves any hazy or white splotches on the tile, dampen a clean cloth with a bit of the grout sealer, and wipe the area until the blotch is gone. Now wipe the tile with a clean, dry cloth to remove any lingering residue.
- Once the grout sealer is completely dry, flick a couple of drops of water onto the sealed surface. If it’s properly sealed, the water should ball into droplets. If the water soaks in, however, the grout isn’t completely sealed and you’ll need to apply another coat of sealer.
Do all types of grout require sealing?
Not all types of grout need to be sealed. Synthetic-based grouts, such as epoxy or urethane grouts, do not require regular sealing. However, if you want to keep your cement-based grout—the most common type—reasonably free of dirt, stains, and mold spots, you’ll need to apply a grout sealer on a regular basis.
What are some tips for laying new tile myself?
If you are starting a tile job from the beginning, not just sealing old grout, but actually laying a new tile surface, heed the advice of Thomas Hawkins, handyman, master electrician, and owner of Electrician Apprentice HQ, who recommends, "For DIY tiling, get a whisk attachment for your corded or cordless drill so you can properly mix your grout and mortar, be sure to seal your tile when your project is complete, and use a mortar that is self-leveling so you're starting off with a completely flat surface before you set the first piece of tile.”
Eddie McFarlane, Strategic Advisor for Provider Experience at HomeX, adds “You’ll want to decide on a layout before you get started. We recommend testing the layout in your space beforehand to make sure it’s exactly what you want by first laying the tile pieces in place without mortar or grout. Make sure you have the right tools on hand: a tile cutter, a rubber mallet, tile spacers, a level, a tile trowel, and mortar. Above all, take the extra little time to clean your tools after use. A dry piece of mortar coming loose and getting on your fresh floor can be very annoying.”
How often does grout need to be sealed?
Sealing grout isn’t a one-and-done task. As a general rule, you should reseal grout that isn’t often wet—such as walls, floors, and fireplace surrounds—once per year. But for best results, you should plan on resealing grout twice per year in areas that often get wet, such as inside a shower or tub, on a kitchen counter, or behind a kitchen or bathroom sink.
How long does it take for grout sealer to dry?
While the specifics can vary, as a general rule, grout sealer is dry enough to walk on within 2 or 3 hours of application. However, it can take up to 48 hours for the sealer to cure completely, so wait a couple of days before allowing heavy traffic on your newly-sealed tile floor, taking a shower or bath in a freshly sealed tub, or putting your just-sealed countertops to heavy use.
Why Trust The Spruce?
This article is edited and updated by Michelle Ullman, the tool expert for The Spruce. She has extensive experience not only in writing about all things related to the home, but also in carrying out various DIY projects, including landscaping, painting, flooring, wallpapering, furniture makeovers, and simple repairs.
For this roundup, she considered dozens of grout sealers, evaluating each for effectiveness, ease of use, and feedback from customers. She also received advice from Thomas Hawkins, who is a handyman, master electrician, and owner of Electrician Apprentice HQ and Eddie McFarlane, Strategic Advisor for Provider Experience at HomeX.