The best grout sealer for most homes is a water-based penetrating (impregnating) sealer such as Aqua Mix Sealer's Choice Gold, Miracle Sealants 511 Impregnator or StoneTech BulletProof Sealer. These soak into the cement grout and line its pores with a repellent, so water and stains bead on the surface while the grout can still breathe. They leave no film to peel, yellow or turn slippery, which is exactly the failure that makes surface-coating sealers a poor choice for grout lines.
The product matters less than three decisions around it: sealing only grout that is fully cured and bone dry, keeping the shower or floor away from water until the sealer has cured (typically 24–72 hours), and knowing whether you need to seal at all. Epoxy and urethane grouts do not need sealer, glazed tile does not need sealer, and natural stone tile usually needs sealing as much as its grout does.
Our Top Picks
- BEST OVERALL: Aqua Mix Sealer's Choice Gold
↓ Jump to Review - BEST FOR STONE TILE & GROUT: Miracle Sealants 511 Impregnator
↓ Jump to Review - BEST FOR KITCHENS & BACKSPLASHES: StoneTech BulletProof Sealer
↓ Jump to Review - BEST VALUE: Tuff Duck Granite, Grout and Marble Sealer
↓ Jump to Review - EASIEST TO FIND: Custom Building Products TileLab Grout & Tile Sealer
↓ Jump to Review - BEST COLOR SEALER: Custom Building Products Polyblend Grout Renew
↓ Jump to Review
Grout Sealers at a Glance
| Product | Type | Look | Best for |
|---|---|---|---|
| Aqua Mix Sealer's Choice Gold | Water-based penetrating | Natural, no sheen | Best overall — showers, floors, stone and grout together |
| Miracle Sealants 511 Impregnator | Penetrating impregnator | Natural, no sheen | Natural stone tile with cement grout |
| StoneTech BulletProof Sealer | Water-based penetrating | Natural, no sheen | Kitchen backsplashes and floors (oil and water stains) |
| Tuff Duck Granite, Grout and Marble Sealer | Water-based penetrating | Natural, no sheen | Budget whole-house jobs |
| Custom Building Products TileLab Grout & Tile Sealer | Water-based penetrating | Natural, no sheen | Quick, widely available refresh jobs |
| Custom Building Products Polyblend Grout Renew | Colorant + sealer | Opaque, uniform color | Stained or mismatched grout |
The 6 Best Grout Sealers
Every product here is a penetrating sealer or, in the last case, a colorant designed for grout lines. Surface-film "grout sealers" were left out deliberately, for reasons explained in the section on sealer types below. Coverage figures vary with how porous your grout is, how wide the joints are and whether you treat the tile faces too, so treat any label coverage figure as a ceiling rather than a promise.
What We Like
- Resists oil-based as well as water-based stains
- Invisible finish with no sheen or color change
- Safe on cement grout, unglazed tile and most natural stone
- Water-based, low odor, easy cleanup
What We Don’t Like
- Premium price per bottle
- Excess must be wiped from glazed tile promptly or it hazes
- Needs fully cured, dry grout to penetrate properly
Product Specs
- Type: Water-Based Penetrating Sealer
- Rank in this guide: #1
Sealer's Choice Gold is the sealer tile setters reach for when they want one product that handles cement grout, unglazed tile and most natural stone in the same room. It is a water-based, fluorochemical-type penetrating sealer: it soaks into the grout and lines the pores with a repellent that resists both water-based and oil-based staining, rather than water alone. That oil resistance is what separates it from the cheapest grout sealers, and it matters on kitchen floors and backsplashes as much as in showers.
It leaves no visible film and does not darken or gloss the grout, so the floor looks the same the day after as it did before — just more stain-resistant. Aqua Mix's own durability claims are among the longest in the category. Like all such claims, they assume ideal conditions; a hard-used shower will still need resealing sooner than a hallway floor.
The trade-off is price per bottle, which sits at the top of the consumer range. On a typical bathroom, where only the grout lines are being sealed, a single quart goes a long way, so the premium per job is modest.
What We Like
- Long track record on natural stone and grout
- Seals stone tile and grout in one application
- No change in color or sheen when applied correctly
- Widely sold in several sizes
What We Don’t Like
- Less oil repellency than premium fluorochemical sealers
- Stronger odor than the mildest water-based products
- Overkill if you only have glazed tile and grout
Product Specs
- Type: Penetrating Impregnator
- Rank in this guide: #2
511 Impregnator has been a staple in stone and tile shops for decades, and it is the pick when the tile itself is porous — marble, travertine, limestone, slate or unglazed quarry — and you want to seal tile and grout in a single pass. It is a true impregnator: it goes into the substrate rather than sitting on it, and it does not change the color or finish of the stone or grout when applied as directed.
Because it is designed for stone first, it penetrates dense materials well, which makes it a good match for a travertine or marble shower where the stone is as vulnerable as the joints between it. The same bottle that seals your grout can be used on a marble vanity top or stone threshold in the same room.
The trade-off is that it is aimed at water and general staining rather than being the most oil-resistant formula available, so on a light-colored kitchen floor that sees cooking spills, a fluorochemical sealer such as Sealer's Choice Gold or BulletProof has the edge. Ventilate well while applying and read the label for the specific cure window.
What We Like
- Repels both water and cooking oil
- Natural look with no surface film
- Works on grout, tile and most natural stone
- Water-based with easy cleanup
What We Don’t Like
- Premium price
- Will not hide or lift existing stains
- Glazed tile must be wiped down quickly after application
Product Specs
- Type: Water-Based Penetrating Sealer
- Rank in this guide: #3
BulletProof is a water-based penetrating sealer built to repel both water-based and oil-based stains, and it is aimed squarely at kitchens: backsplash grout behind a cooktop, floor grout in front of the sink, and stone countertops nearby. Grout behind a range takes a steady mist of cooking oil, and oil is what turns light grout permanently yellow-grey. A sealer with genuine oil repellency is the difference between grout that wipes clean and grout that needs scrubbing or recoloring.
Like the other top picks it leaves a natural, no-sheen finish and is suitable for grout, tile and most natural stone. It is a strong alternative to Sealer's Choice Gold, and many installers treat the two as interchangeable; which one you buy can reasonably come down to which is easier to find locally.
The trade-off is cost — it sits at the premium end — and, like any penetrating sealer, it cannot do much for grout that is already stained. Clean first, seal second.
What We Like
- Low cost per square foot
- Low odor, water-based
- One product for grout, granite and marble
- Natural finish
What We Don’t Like
- Expect to reseal more often than with premium sealers
- Less suited to oil-heavy kitchen areas
- Less widely stocked in stores than the big tile brands
Product Specs
- Type: Water-Based Penetrating Sealer
- Rank in this guide: #4
Tuff Duck is the budget answer for a whole-house job: several bathrooms, a laundry room and a kitchen floor where the bill for a premium sealer starts to add up. It is a water-based penetrating sealer, low in odor, and as the name says it is intended for granite, marble and grout alike, so it can cover most of the porous surfaces in a typical home.
For grout in bathrooms and floors that see mostly water and everyday dirt, it does the core job well: it lowers absorption so spills bead and mop water does not wick into the joints. That is the main thing most grout needs.
The trade-off is that budget penetrating sealers generally need recoating more often than the premium fluorochemical products, and heavy oil exposure is not where they shine. Plan on resealing high-use showers on the shorter end of the usual schedule.
Custom Building Products TileLab Grout & Tile Sealer
See It on AmazonWhat We Like
- Stocked in most home-center tile aisles
- Pairs naturally with Polyblend cement grout
- Water-based, natural finish
- Good for routine reseals
What We Don’t Like
- Not as stain-resistant as premium fluorochemical sealers
- Shorter reseal interval in wet, high-use areas
Product Specs
- Type: Water-Based Penetrating Sealer
- Rank in this guide: #5
Custom Building Products makes Polyblend, one of the most widely used cement grouts in North American home centers, and TileLab Grout & Tile Sealer is its matching sealer. It is a water-based penetrating sealer for cement grout and porous tile, it is on the shelf in most big-box tile aisles, and it is the straightforward choice when you have just grouted with Polyblend and want a sealer from the same system.
It is a good fit for the routine reseal: a shower that was sealed at installation and now darkens when splashed, or a bathroom floor due its periodic refresh. The finish is natural and the cleanup is water.
The trade-off is protection level. It is a solid everyday sealer rather than a premium stain-blocker, so for a light-grout kitchen floor or a heavily used family shower, the extra oil and stain resistance of the top three picks is worth paying for.
What We Like
- Recolors and seals in one step
- Hides stains a clear sealer cannot
- Wide color range matched to a major grout line
- Water-based cleanup
What We Don’t Like
- Slow, careful brush work
- Surface coating can wear in traffic lanes and on shower floors
- Must be wiped off tile faces before it sets
Product Specs
- Type: Grout Colorant & Sealer
- Rank in this guide: #6
Grout Renew is not a clear sealer, and that is the point. It is a colorant that coats the grout lines in an opaque, uniform color and seals them at the same time. When grout is already stained, blotchy or the wrong shade, no clear penetrating sealer will fix it; this will. It is sold in a wide range of colors matched to the Polyblend grout line, works on sanded and unsanded cement grout, and goes on by brush along the joints.
Because it is a coating rather than an impregnator, it behaves differently from the five products above. It sits on the grout surface, so it must go on clean, dry, sound grout, and excess on the tile has to be wiped off before it sets. Done carefully it can make a tired floor look newly grouted, and lighter-to-darker color changes are the easiest to get right.
The trade-off is labor and permanence: it is slow, detail work on a full floor, and in traffic lanes or on shower floors expect wear over time that calls for touch-ups. It is a restoration product, not a routine sealer for new grout.
Penetrating vs Membrane (Topical) Sealers
Every grout sealer falls into one of two families, and the choice between them matters more than the brand.
Penetrating sealers — also called impregnating sealers — are carried into the grout by water or solvent. The carrier evaporates and leaves behind a repellent (typically silane, siloxane or fluorochemical compounds) that lines the pore walls without filling them. Water and oil can no longer wick in easily, but water vapor can still escape. That breathability is the whole point in a shower: moisture that gets behind or under the tile can dry out through the grout instead of being trapped. Penetrating sealers are invisible, do not change slip resistance, and cannot peel because there is nothing on the surface to peel. If you want the chemistry in more depth, the same compounds are covered in silane vs siloxane sealers.
Membrane-forming (topical) sealers are acrylic or urethane coatings that build a film on top of the grout. They can add sheen and make grout very stain-resistant while the film is intact. In grout lines, though, the film tends to wear unevenly, scuff in traffic lanes, peel in wet areas and trap moisture beneath it, which leads to whitish, cloudy patches. On glazed tile they leave a haze that is hard to remove. Topical sealers have a place on some concrete and unglazed surfaces — see the concrete sealer guide — but for grout they are the wrong tool.
| Penetrating (impregnating) | Membrane (topical) | |
|---|---|---|
| Where it sits | Inside the pores | Film on the surface |
| Appearance | Invisible, natural | Gloss or satin sheen |
| Breathable | Yes | Largely no |
| Peeling / haze risk | None if excess is wiped off | Moderate to high in wet areas |
| Slip resistance | Unchanged | Can be reduced |
| Showers | Recommended | Avoid |
When the Tile Needs Sealing Too
Glazed ceramic and glazed porcelain tile are already impervious; sealer on the glaze does nothing except leave a haze if you fail to wipe it off. Unglazed and porous tile is different. Natural stone — marble, travertine, limestone, slate, and to a lesser degree granite — absorbs water and oil, and in a shower or kitchen it stains as readily as grout. Unglazed quarry tile, terracotta and cement tile also need sealing. In those rooms, seal the whole surface, tile and grout together, with a stone-rated penetrating sealer such as 511 Impregnator or Sealer's Choice Gold. Matte unglazed porcelain varies; a drop of water left for ten minutes will tell you whether it absorbs. For stone-specific guidance, see the guides to the best granite sealers and the best natural stone sealers.
Water-Based vs Solvent-Based
Penetrating sealers use either water or a solvent (typically mineral spirits or similar petroleum distillates) as the carrier that delivers the active ingredient into the grout.
Water-based sealers now dominate the consumer market, and for good reason. They are low in odor and VOCs, clean up with water, and are much more comfortable to use in a small, poorly ventilated bathroom. Modern water-based fluorochemical formulas match or beat older solvent products on stain resistance. Their main limitation is that the grout must be thoroughly dry, because water in the pores blocks the sealer from penetrating.
Solvent-based sealers tend to penetrate dense materials such as polished granite and some porcelains more readily, and they can tolerate cooler conditions. The cost is strong fumes and flammability, which in a windowless bathroom means a fan, an open door and a respirator rated for organic vapors. They can also darken some stones and grouts slightly more than water-based formulas.
For grout alone, water-based is the right default. Choose a solvent-based product only if the manufacturer of your stone recommends it or you are sealing very dense stone along with the grout.
Brush, Roller or Spray?
How the sealer comes out of the bottle decides how fast the job goes and how much cleanup you face afterwards.
| Applicator | Speed | Mess on tile | Best use |
|---|---|---|---|
| Brush-tip bottle / small artist brush | Slow | Minimal | Glazed tile where only grout should be sealed; backsplashes |
| Roller-wheel applicator bottle | Fast on straight lines | Low | Large floors with long, regular joints |
| Spray bottle or aerosol | Fastest | High — tile must be wiped | Stone and unglazed tile where everything gets sealed |
| Foam brush, sponge or lambswool pad (flood coat) | Fast | High — tile must be wiped | Whole-surface sealing of stone floors and showers |
On glazed tile, a brush tip or roller wheel is worth the extra time because it puts sealer only where it is needed and leaves almost nothing to wipe off. On stone, where the tile needs sealing too, flooding the surface with a spray or pad is both faster and better, since you want even coverage on everything. In either case, the rule is the same: whatever is still sitting wet on the surface after the dwell time printed on the label — usually 5 to 15 minutes — gets wiped off with a clean, dry cloth.
Showers vs Floors vs Backsplashes
| Location | Main threat | Sealer priority | Typical reseal |
|---|---|---|---|
| Shower walls and floor | Constant water, soap scum, mildew | Breathable penetrating sealer; never topical | 1 – 3 years |
| Bathroom floor | Splashes, mop water, foot traffic | Penetrating, natural finish | 2 – 4 years |
| Kitchen floor | Food, grease, frequent mopping | Oil-resistant penetrating sealer | 2 – 3 years |
| Kitchen backsplash | Cooking oil mist, sauces | Oil-resistant penetrating sealer | 3 – 5 years |
| Entry and mudroom | Grit, salt, wet boots | Penetrating; consider color sealer on dark grout | 2 – 3 years |
Showers are where sealer choice matters most and where the most mistakes happen. Sealer does not waterproof a shower — the waterproofing membrane behind the tile does that. What sealer does is slow absorption, which keeps grout from staying damp, discoloring and growing mildew between uses. That only works if the sealer breathes, so use a penetrating product and seal walls and floor. The shower floor and the bottom row of wall tile take the most water and wear out first.
Change of plane — the corners, the joint between wall and tub, and the line where wall meets shower floor — should be flexible sealant, not grout. If yours is cracked grout, cut it out and replace it with 100% silicone before sealing, and give the silicone its full cure time first; our guide to how long caulk takes to dry covers the waiting times.
Floors take abrasion as well as water. Foot traffic wears sealer out of the grout surface over time, so traffic lanes — doorways, in front of the sink and toilet — need resealing before the edges of the room. A natural, no-sheen penetrating sealer keeps slip resistance unchanged, which matters on a bathroom floor that gets wet.
Backsplashes stay dry most of the time, so water is less of a concern than oil. Grout behind a cooktop picks up a fine mist of cooking oil that a water-only repellent will not stop. That is the case for an oil-resistant sealer such as StoneTech BulletProof or Sealer's Choice Gold, and a backsplash sealed with one of them can go several years between coats.
How to Tell If Grout Needs Sealing
The water-drop test takes five minutes and answers the question for any grout, new or old.
- Make sure the grout is clean and dry — no recent shower, no recent mopping.
- Put a few drops of water on the grout line in several places, including the busiest spots: shower floor, in front of the sink, doorways.
- Watch for 3–5 minutes. If the water beads and the grout stays its normal color, the sealer is working.
- If the grout darkens within a minute or two, or the water soaks in and disappears, the grout is unsealed or the sealer has worn out. Reseal.
For kitchens, add a drop of cooking oil to a discreet spot and leave it ten minutes before wiping. If it leaves a dark ring, the grout needs an oil-resistant sealer. Remember the results vary across a room: it is common for the shower floor to fail the test while the upper walls still pass, and you only need to reseal what fails.
How to Seal Grout Properly
Most sealer failures are application failures, and nearly all of them come down to dirty grout, damp grout or too little patience.
1. Clean thoroughly. Sealer locks in whatever is in the grout, including stains and soap scum. Scrub with a pH-neutral or dedicated grout cleaner and a stiff nylon brush. For mildew in a shower, an oxygen bleach cleaner works without the risk that chlorine bleach poses to some colored grouts and stone. Avoid acidic cleaners on cement grout and on marble, limestone and travertine, which they etch.
2. Rinse and dry completely. This is the step people rush. Grout that looks dry can still hold moisture an inch down. Leave a shower unused for at least 24 hours after cleaning, longer in a humid climate, and run the exhaust fan. Water in the pores blocks penetration, and the sealer ends up sitting near the surface where it wears off quickly.
3. Protect what should not be sealed. Tape off adjacent wood, painted trim and metal fixtures. Some sealers can mark polished brass or chrome if left to dry on them.
4. Apply a saturating coat. Work in sections of a few square feet. Apply enough sealer that the grout looks wet throughout, let it soak in for the dwell time on the label, then apply a second wet-on-wet coat on porous grout if the label calls for it. Many penetrating sealers specify a second coat while the first is still damp, roughly 5–15 minutes later.
5. Wipe off the excess. Within the label's window, wipe all excess from the tile faces with a clean, dry, lint-free cloth. Sealer left to dry on glazed tile becomes a sticky or hazy film, and removing it later typically means re-wetting it with more sealer or using a dedicated haze remover.
6. Let it cure before water. Most penetrating sealers are dry to the touch in an hour or two, but cure takes longer. Typical guidance is light foot traffic after a few hours, normal water exposure after 24–72 hours, and full stain resistance after up to several days. In practice: do not shower for 24 hours at minimum, and give it 72 hours if you can, especially with cool temperatures or high humidity. Do not mop the floor with cleaners for several days.
7. Test. After cure, repeat the water-drop test. Spots that still darken missed sealer or were too damp; give them another coat.
Grout That Doesn't Need Sealing
Epoxy grout is a two-part resin rather than a cement, and it is essentially non-porous once cured. It resists stains and water on its own, does not need sealer, and sealer will not penetrate it anyway — it simply sits on top. Epoxy grout costs more and is harder to install, which is why it is common in commercial kitchens and increasingly in high-end showers, but it removes resealing from the maintenance list permanently.
Pre-mixed urethane and acrylic grouts, sold ready to use in a bucket, are also typically marketed as stain-resistant without sealing. Check the product sheet for the specific grout you used, because formulations differ.
Glazed tile never needs sealing, only the cement grout between it. And caulked joints — silicone or urethane sealant at corners and changes of plane — are not grout and should not be "sealed" with grout sealer.
If you do not know what grout is in your shower, a simple clue is the drop test on old, never-resealed grout: cement grout that has gone years without sealer will darken almost instantly, while epoxy will not absorb water at all, and its surface tends to look slightly glossier and feel harder.
Color Sealers and Grout Paint
Color sealers, also called grout colorants or grout stains, are a different category from clear sealers. They are pigmented coatings — usually water-based acrylic or epoxy-modified — that sit on the grout surface and give it a new, uniform color while sealing it. Grout "paint" pens and markers are the same idea in a smaller, less durable form.
They are worth using when the grout is permanently stained, when patch repairs do not match the original, or when you want to change the grout color without regrouting. Polyblend Grout Renew is the most widely available example, and Aqua Mix also sells a grout colorant. They are a poor choice on new, clean grout that only needs protection, because they add a film that a penetrating sealer avoids.
Three rules make color sealers work. First, the grout must be clean, dry and sound; loose or crumbling grout needs replacing, not coating. Second, apply with a fine brush, staying within the joint, and wipe any color off glazed tile before it dries, typically within an hour, though the label is the authority. Third, give it the full cure time before water, which is often longer than for clear sealers. Do not apply a clear penetrating sealer over a colorant unless the colorant manufacturer says to.
How Often to Reseal
Reseal when the water-drop test fails, not by the calendar alone. As a rough guide:
- Shower floors: every 1–2 years, the highest-wear location in the house.
- Shower walls: every 2–3 years.
- Bathroom and kitchen floors: every 2–4 years, with traffic lanes going first.
- Backsplashes: every 3–5 years.
- Low-use areas: premium sealers can last considerably longer — manufacturers of the top products cite multi-year to decade-plus protection — but only where water and abrasion are light.
Two habits extend the interval more than any brand choice. Clean with pH-neutral cleaners: strongly acidic and strongly alkaline cleaners, and steam cleaners, break down penetrating sealers faster. And squeegee or towel the shower after use, which cuts both the water load and soap scum buildup. Resealing is simple because penetrating sealers do not build up: clean, dry and apply the same product again, with no need to strip the old sealer first.
Frequently Asked Questions
A water-based penetrating (impregnating) sealer is the best type for almost all cement grout. It soaks into the grout and lines the pores with a water- and stain-repellent compound, leaving no surface film, so it cannot peel, haze or make the floor slippery, and the grout can still breathe. That breathability matters in showers, where trapped moisture causes cloudy patches and mildew. Membrane or topical sealers, which form a coating on top, tend to wear unevenly and peel in grout lines. For kitchens, choose a penetrating sealer that also repels oil, such as Aqua Mix Sealer's Choice Gold or StoneTech BulletProof Sealer.
For standard cement grout, most grout manufacturers specify around 48–72 hours before sealing, and longer in cool or humid conditions. The grout needs to have cured and released most of its mixing water; sealing too early traps moisture and prevents the sealer from penetrating. Rapid-setting grouts can often be sealed sooner. Follow the time printed on the grout bag rather than the sealer bottle, since it is the grout's cure that sets the schedule. Epoxy grout does not need sealing at all.
Typically 24–72 hours, depending on the product, temperature and humidity. Most penetrating sealers are dry to the touch within an hour or two, but they need longer to cure before they reach full water resistance. Wait at least 24 hours in all cases, and 72 hours if the room is cool, humid or poorly ventilated, or if the label says so. Avoid cleaning products on the sealed surface for several days. Showering too soon washes uncured sealer out of the grout and leaves patchy protection.
Use the water-drop test. On clean, dry grout, place a few drops of water and watch for three to five minutes. If the water beads and the grout keeps its color, it is sealed. If the grout darkens quickly or the water soaks in, it is unsealed or the sealer has worn out. Test several spots, especially high-use areas like the shower floor and doorways, because sealer wears unevenly and you may only need to reseal part of the room.
No. Epoxy grout is a two-part resin that cures to a dense, essentially non-porous solid, so it resists water and stains on its own. Sealer cannot penetrate it and would only sit on the surface. Many pre-mixed urethane and acrylic grouts are also sold as not needing sealer, though you should check the specific product sheet. Only cement-based grout, sanded or unsanded, needs regular sealing.
Only if the tile is porous. Glazed ceramic and glazed porcelain do not absorb sealer, and any left on them dries to a haze, so wipe it off within the label's dwell time. Natural stone such as marble, travertine, limestone and slate, along with unglazed quarry, terracotta and cement tile, does absorb water and oil and should be sealed along with the grout using a stone-rated penetrating sealer. A drop of water left on the tile for ten minutes will show whether it absorbs.
You can, but the sealer will lock the stain in. Clean the grout with a pH-neutral grout cleaner or oxygen bleach and a stiff brush, rinse, and let it dry for at least 24 hours before sealing. If stains will not come out, a clear sealer will not hide them; use a grout colorant such as Polyblend Grout Renew, which recolors and seals in one step, or replace the worst sections of grout.
No. Grout sealer makes grout water-resistant, slowing absorption so water beads and evaporates rather than soaking in, but it does not make a shower waterproof. Waterproofing is the job of the membrane or backer system behind the tile. Sealer's role is to keep grout cleaner, reduce staining and mildew, and help it dry faster between uses. Cracked grout or failing caulk at corners lets water through regardless of sealer and must be repaired first.