Buying guide
Best Grout Sealer: Penetrating, Brush-On or Colour Seal?
Which sealer suits your grout and tile, how many bottles you need, and the prep that makes it work.
As an Amazon Associate I earn from qualifying purchases. This guide is written from product specifications, industry standards and our calculators — it is not a hands-on product test. Affiliate disclosure
Cement grout is porous: it drinks water, soap and spills, and that is what stains it. A penetrating sealer soaks into the grout and makes it repel water without changing how it looks. A colour sealer (colourant) coats the grout, changes or restores its colour and seals it in one step. Epoxy grout needs neither.
This guide compares the types and works out how much to buy with the same formula as our tile and grout sealer calculator. For the step-by-step method, see how to seal grout and tile.
Compared by type
Pros and cons describe each type from its specifications. The product in each row is a current, well-rated option of that type on Amazon, refreshed twice a day — check the listing's specifications against the “check” line before you buy.
Penetrating (impregnating) sealer
Best for: New cement grout in showers, floors and backsplashes
AQUA-X 16 Oz. Grout Sealer, Clear Grout and Tile Sealer, Natural Finish, Professional Grade, Indoor & Outdoor, Fast Dry and Long Lasting Protection$25.99View on Amazon →Check: Water- or solvent-based, and how long before the first water exposure
- Invisible — does not change the grout colour
- Lets the grout breathe, so moisture can escape
- Can go over the whole surface on most glazed tile
- Needs reapplying every 1–3 years
- Does not hide existing stains
- Needs clean, fully cured grout
Sealer with brush or roller applicator
Best for: Sealing joints only, with little waste
Miracle Sealants Sealer Applicator & Tray for Tile, Stone & Grout Sealers$4.97View on Amazon →Check: Applicator tip width to match your joints
- Puts sealer only where it is needed
- Less haze to wipe off the tile
- Quick for small bathrooms
- Slow on large floors
- Small bottles cost more per square foot
- Tips can wear out
Grout colourant (colour seal)
Best for: Stained or mismatched old grout
MAPEI UltraCare Grout Refresh, Universal Grout Colorant & Sealer, 8 oz Bottle – Easy Grout Restoration & Protection, 5047 Charcoal$19.72View on Amazon →Check: Colour range and whether it needs a sealer on top
- Restores an even colour without regrouting
- Seals and colours in one step
- Long-lasting on floors
- Slow, careful work joint by joint
- Must be wiped off the tile face promptly
- Changes the look — test a patch
Natural stone impregnator
Best for: Marble, travertine, slate and unglazed tile — face and grout
Miracle Sealants 511 Impregnator Penetrating Stone & Tile Sealer, Pint$18.75View on Amazon →Check: Rated for your stone, and whether it enhances (darkens) colour
- Protects porous stone from staining
- Seals grout at the same time
- Enhancing versions deepen colour
- More coats and more product on porous stone
- Higher cost per quart
- Does not stop etching from acids
Grout cleaner (prep before sealing)
Best for: Cleaning old grout before sealing
Zep Grout Cleaner and Brightener - 32 Ounce (1 Bottle) - ZU104632 - Deep Cleaning Formula Removes Old Stains From Grout$8.98View on Amazon →Check: pH-neutral or alkaline — avoid acids on stone
- Sealer bonds only to clean grout
- Removes soap scum and body oils
- Often all an old grout line needs
- Needs scrubbing and a full dry-out before sealing
- Strong cleaners can dull some finishes
- Another product to buy
| Type | Current option | Pros | Cons |
|---|---|---|---|
| Penetrating (impregnating) sealerBest for: New cement grout in showers, floors and backsplashesCheck: Water- or solvent-based, and how long before the first water exposure | AQUA-X 16 Oz. Grout Sealer, Clear Grout and Tile Sealer, Natural Finish, Professional Grade, Indoor & Outdoor, Fast Dry and Long Lasting Protection$25.99View on Amazon → |
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| Sealer with brush or roller applicatorBest for: Sealing joints only, with little wasteCheck: Applicator tip width to match your joints | Miracle Sealants Sealer Applicator & Tray for Tile, Stone & Grout Sealers$4.97View on Amazon → |
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| Grout colourant (colour seal)Best for: Stained or mismatched old groutCheck: Colour range and whether it needs a sealer on top | MAPEI UltraCare Grout Refresh, Universal Grout Colorant & Sealer, 8 oz Bottle – Easy Grout Restoration & Protection, 5047 Charcoal$19.72View on Amazon → |
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| Natural stone impregnatorBest for: Marble, travertine, slate and unglazed tile — face and groutCheck: Rated for your stone, and whether it enhances (darkens) colour | Miracle Sealants 511 Impregnator Penetrating Stone & Tile Sealer, Pint$18.75View on Amazon → |
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| Grout cleaner (prep before sealing)Best for: Cleaning old grout before sealingCheck: pH-neutral or alkaline — avoid acids on stone | Zep Grout Cleaner and Brightener - 32 Ounce (1 Bottle) - ZU104632 - Deep Cleaning Formula Removes Old Stains From Grout$8.98View on Amazon → |
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Prices as of Sep 27, 2026, 9:00 PM UTC. Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon.com at the time of purchase will apply to the purchase of this product.
How much sealer you need
Coverage depends on what you seal: grout lines alone go a long way; porous stone drinks several times more. The tile and grout sealer calculator uses the coverage figures below; the example runs the same function.
Worked example: A 120 sq ft bathroom floor
- Glazed porcelain, grout lines only, one coat at about 400 sq ft per quart → 0.3 qt (1 × 24 oz bottle)
- Travertine, face and grout, two coats at about 150 sq ft per quart → 1.4 qt (2 × 24 oz bottles)
0.3 qt for glazed tile versus 1.4 qt for travertine — buy the next size up so you do not run out mid-coat.
What to look for on the label
- Penetrating vs topical: penetrating sealers soak in and do not peel; topical coatings sit on top and can wear and yellow.
- Cure time before sealing: most new cement grout needs 48–72 hours, some products longer. Read the grout bag too.
- Time to first water exposure — important in a shower you need to use.
- Surface: some sealers are for grout only; others are rated for unglazed tile and natural stone.
- Reapplication interval, and a water-drop test to tell when it is due.
Which sealer for which job
| Surface | Usual choice | Notes |
|---|---|---|
| Glazed porcelain or ceramic, cement grout | Penetrating sealer on the joints | The glazed face needs no sealer |
| Shower walls and floor | Penetrating sealer, reapplied yearly | Let grout cure fully first |
| Old, stained grout | Deep clean, then colourant | Colourant hides what cleaning cannot |
| Natural stone | Stone impregnator on face and grout | Two coats minimum |
| Epoxy or urethane grout | No sealer | Already non-porous |
Choosing the grout itself? See sanded vs unsanded vs epoxy grout, and size it with the grout calculator.
Shop the types above
As an Amazon Associate I earn from qualifying purchases.
AQUA-X 16 Oz. Grout Sealer, Clear Grout and Tile Sealer, Natural Finish, Professional Grade, Indoor & Outdoor, Fast Dry and Long Lasting Protection
$25.99
View on Amazon →Miracle Sealants Sealer Applicator & Tray for Tile, Stone & Grout Sealers
$4.97
View on Amazon →MAPEI UltraCare Grout Refresh, Universal Grout Colorant & Sealer, 8 oz Bottle – Easy Grout Restoration & Protection, 5047 Charcoal
$19.72
View on Amazon →Miracle Sealants 511 Impregnator Penetrating Stone & Tile Sealer, Pint
$18.75
View on Amazon →Zep Grout Cleaner and Brightener - 32 Ounce (1 Bottle) - ZU104632 - Deep Cleaning Formula Removes Old Stains From Grout
$8.98
View on Amazon →
Miracle Sealants GRT SLR, Grout Sealer, 6 oz.
$8.99
View on Amazon →Prices as of Sep 27, 2026, 9:00 PM UTC. Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon.com at the time of purchase will apply to the purchase of this product.
Safety notes
- Ventilate well — open windows and run the bathroom fan; solvent-based sealers give off strong fumes.
- Wear chemical-resistant gloves and eye protection, and keep children and pets out until it has cured.
- Wipe drips off tile and fixtures promptly; dried sealer leaves a haze that is hard to remove.
Frequently asked questions
What is the best type of grout sealer?
For most cement grout, a penetrating (impregnating) sealer: it soaks in, stays invisible and lets moisture escape. Use a colour sealer when old grout is stained or uneven.
How long after grouting can I seal?
Usually 48 to 72 hours for standard cement grout, but some grouts and sealers need longer. Follow the longer of the two labels.
How often should grout be sealed?
Every 1 to 3 years for penetrating sealers, depending on wear. When water drops stop beading and darken the grout, it is time.
Do I need to seal porcelain tile?
Glazed porcelain and ceramic faces are non-porous and need no sealer — seal the grout only. Unglazed tile and natural stone need the whole surface sealed.
Does epoxy grout need sealing?
No. Epoxy and most urethane grouts are non-porous and stain-resistant without a sealer.