Our Top Picks
- Light-reflective glass beads
- Pre-mixed, no sealing
- 3-day water cure
- Smooth, even surface
- Greenguard certification
- Color can be purchased separately
- Non-sanded Portland cement
- ANSI A118.6 rated
- Safe on glass and polished stone
- Crack, stain and shrink resistant
- Resealable container
- Suitable for dry and damp areas
- User-friendly tube
- Ideal for refreshing existing grout
- VOC-compliant
Our Review Criteria: Formula type sets everything else in a grout purchase: cement, urethane, epoxy, and acrylic each suit different joint widths, so we sorted picks by chemistry first. We compared water and stain resistance, mold resistance, cure time, and how forgiving each product is for a DIY application. Recognized standards carried weight, including the ANSI A118.6 grout-performance rating and Greenguard Gold low-VOC certification, and we checked those against independent reviews and feedback from installers and homeowners. We verify every recommended product is currently available and replace any pick that has been discontinued.
Grout is one of the parts of a bathroom remodel that quietly does the most work. It locks your tiles in place, blocks water from reaching the wall behind them, and frames the whole look of your shower. Choose the wrong product and you invite cracks, leaks, and grout lines that turn pink with mildew a few months in.
A shower is a hard place for grout to live: constant water, soap film, and swings in humidity all attack the joint. The right pick is waterproof or near it, resists mold, and stays workable long enough for you to finish the wall. We compared five shower grouts across the formulas a homeowner actually chooses between, cement, urethane, epoxy, and acrylic, and matched each to the job it does best.
How to Pick the Right Grout
All grout looks like colored powder or paste on the shelf, but inside a shower the chemistry decides whether your joints stay clean or turn into a mildew trap. The two questions that settle most of the decision are how wide your tile joints are and which formula you want: cement, urethane, epoxy, or acrylic. Here is what each choice buys you.
Product Reviews
We compared these picks on water resistance, ease of application, cure time, and how well each suits the joint width and tile it is meant for, so you can match a grout to your bathroom instead of guessing.
Bostik Dimension StarGlass Grout
Best Grout for Glass Tiles
Bostik Dimension is a pre-mixed urethane grout that suspends tiny reflective glass beads in a translucent binder. Light passes into the joint and bounces back, so the grout reads as a soft, three-dimensional sparkle, which is the whole reason it pairs so well with clear glass and metallic mosaic that ordinary opaque grout dulls.
Unlike cement, it ships ready to use, flexes with minor house movement instead of cracking, and never needs a sealer. The RapidCure formula is the current version of this line, tightening the dry time that urethane grouts are known for. For a feature wall of glass tile, this is the pick that actually shows off the tile rather than framing it in flat grout.
What We Like
Reflective, Light-Catching Joints
The micro-glass beads let light travel through the joint and into the tile, an effect cement grout cannot produce. On glass or pearl mosaic it turns the grout lines from a visual interruption into part of the design.
Never Needs Sealing
The urethane binder is naturally water and stain resistant straight from the tub, so there is no sealing step now and no resealing later. That is a real saving of time and upkeep over a cement joint in a wet shower.
Faster Cure Than Older Urethanes
The RapidCure formula is approved for intermittent water exposure after about three days, far quicker than the week some urethane grouts demand, and it wipes off the tile face cleanly during install so you fight less haze.
What We Don't Like
Still a Multi-Day Wait
Three days is faster than the old standard but slower than a quick-set epoxy, so a one-bathroom household has to plan around it before the first shower.
Ventilate and Glove Up
It is a urethane chemical product, so wear gloves, run the fan, and follow the label. Skim off and remove any excess from the tile face while it is fresh, because cured urethane haze is stubborn to scrub away.
Product Specs
| Type | Pre-mixed urethane, glass-filled |
|---|---|
| Joint Width | 1/16 to 1/2 inch |
| Weight | 9 pounds |
| Water Cure | Intermittent exposure after about 3 days |
| Unique Feature(s) | Light-reflective glass beads, no sealing needed |
Laticrete SpectraLock Pro Premium
Most Durable Grout
If you want to grout a shower once and forget about it, Laticrete SpectraLock Pro Premium is the answer. It is an epoxy grout, the formula tilesetters reach for when waterproofing and durability matter more than easy install, and it earns the durability award here on those grounds.
It cures into a hard, non-porous joint that shrugs off water, grease, and stains, which makes it the strongest choice for a steam shower or a floor that sees daily traffic. It asks more of the installer than any other pick on this list, so it rewards patience and small batches.
What We Like
Hard-Wearing and Waterproof
SpectraLock resists cracking, fading, and the harsh chemicals in many shower cleaners, so you can scrub it without wearing it down. Cured epoxy is non-porous, which is why it protects the subfloor beneath a shower better than any cement joint.
Certified Low-VOC
Though it is a chemical epoxy, it is Greenguard Gold Certified for low volatile organic compound emissions, the certification used to clear products for schools and hospitals. That is a meaningful safety mark for a material curing inside your home.
Consistent Color
The color comes from a separate powder, Part C, mixed into the resin, so the finished shade is uniform across the wall without the blotching that uneven cement grout can show.
Important Note
What We Don't Like
Hard for Beginners
Epoxy has a limited working window, roughly 30 to 40 minutes, before it stiffens in the bucket. You have to work in small batches and clean each tile right away, because dried epoxy haze is very difficult to remove later.
Temperature Sensitive
It cures best at room temperature. A hot bathroom makes it set almost instantly, while a cold one drags the cure out, so control the room before you start.
Product Specs
| Type | Epoxy |
|---|---|
| Joint Width | 1/16 to 1/2 inch |
| Weight | 9 pounds |
| Color | White |
| Unique Feature(s) | High-quality materials and results |
Custom White Dry Non-Sanded Grout
Most Budget-Friendly Grout
For a budget shower job with narrow joints, Custom Building Products White Dry Non-Sanded Grout is the value pick. It is a non-sanded Portland cement grout carrying an ANSI A118.6 rating, the standard that covers grout performance, so you get proven strength from a bag that costs only a few dollars.
Being non-sanded, it is built for tight joints up to 1/8 inch and for surfaces that grit would scratch. You can run it across polished marble, glass mosaic, or high-gloss ceramic without marring the finish, and it works on showers, backsplashes, and countertops alike. The honest verdict: it is the most cost-effective way to grout a wall properly, as long as you commit to sealing it.
What We Like
Lowest Cost on the List
This is plain, no-frills cement grout sold in a small bag, which is why it is the cheapest way to fill a short run of joints. For a single shower wall or a backsplash, you buy only what you need instead of a large premium tub.
Clean Bright White
It cures to a crisp white that suits white tile and light stone, and a white joint is easy to refresh with a colorant later if you want to change the look. Mix it evenly for a uniform shade across the wall.
Safe on Delicate Tile
With no sand, it spreads smoothly into narrow joints and will not scratch glass, polished stone, or metal tile. The same fine, non-shrink body that helps it bond also lets it pull double duty on countertops and backsplashes.
What We Don't Like
Needs Sealing
Like all cement grout, it is porous and must be sealed after it cures, then resealed periodically, to keep water and soap out. Skip that step in a shower and it will stain and grow mildew.
Mixing and Timing
You mix this powder with water yourself, so getting a consistent batch takes a little care, and it has a working window before it stiffens. Apply it in a moderate room temperature, not a cold one, for a clean set.
Product Specs
| Type | Non-sanded Portland cement |
|---|---|
| Joint Width | Up to 1/8 inch |
| Rating | ANSI A118.6 |
| Use | Interior and exterior, walls and floors |
| Unique Feature(s) | Low cost, safe on delicate tile |
SimpleFix Alabaster Pre-Mixed Adhesive and Grout
Best Pre-Mixed Grout
SimpleFix is built for the DIYer who wants to skip the mixing drill entirely. It is a two-in-one product that acts as both the adhesive that sticks small tile to the wall and the grout that fills the joints, which is why it takes the pre-mixed pick: one ready-to-use tub replaces two separate bagged products, so there is nothing to measure or mix.
Sold pre-mixed in a quart container, it suits smaller shower repairs and new backsplashes rather than a full re-tile. For a beginner patching a few tiles, it removes the two steps most likely to go wrong, measuring water and timing the set.
What We Like
Zero Prep Time
You pop the lid and start working. There is no dust, no measuring, and no batch to get wrong, and if you have to stop, you reseal the container and pick it up later. That convenience is the whole point of a pre-mixed grout.
Water Resistant
Even as an adhesive-and-grout combo, it is formulated to resist shrinking and cracking and holds up in damp areas. It bonds to ceramic, porcelain, and stone, so it earns a spot in the garage for the occasional repair.
Clean, Consistent Finish
The paste spreads smoothly and, because it ships pre-mixed, the color is uniform every time. You avoid the patchy shading that shows up when a powdered cement grout is mixed unevenly.
What We Don't Like
Stiff to Tool
Some users find the consistency drier than traditional grout, so it takes a bit more effort to press fully into the joints and smooth the surface.
Walls Only
It is not rated for the foot traffic or standing water of a shower floor pan. Keep it to walls and backsplashes, and use a floor-rated grout in the base.
Product Specs
| Type | Sanded |
|---|---|
| Joint Width | 1/16 to 3/8 of an inch |
| Weight | 2.09 pounds |
| Color | White or grey |
| Unique Feature(s) | Pre-mixed |
Red Devil Pre-Mixed Tile Squeeze Tube
Best Grout for Small Repairs
Sometimes you do not need to re-grout the shower, you just need to close a few cracked or stained joints before water gets behind the tile. Red Devil’s squeeze tube is built for exactly that small repair, which is why it takes the best-for-small-repairs slot.
It is a pre-mixed, acrylic-based paste that works on mosaic, ceramic, and porcelain. It is not a full-installation grout, but for touching up a failing line or a corner it is faster and far less messy than mixing a batch you will mostly throw away.
What We Like
No Tools Needed
There is no float and no mixing. You squeeze the tube straight into the joint, smooth it with a finger or a small tool, and you are done. Being unsanded, it leaves a smooth finish that blends into the existing grout around it.
Water Cleanup
The acrylic base wipes up with water before it dries, and you get roughly 10 to 15 minutes to tool the joint and clear the excess off the tile. That forgiving window suits a first-timer doing a quick fix.
Mold Resistant
The formula is water-resistant and carries mildewcides to slow black mold from returning to the spot you just repaired, so a cosmetic fix also buys you some protection.
What We Don't Like
It Shrinks
Acrylic shrinks more than cement or epoxy as it dries, so a deeper gap often needs a second pass to finish flush. Plan on two thin coats rather than one heavy one.
Odor and Dust
It carries a sharp acrylic smell during application, so run the exhaust fan. It also contains titanium dioxide, so avoid breathing any dried dust if you ever sand a repaired joint.
Product Specs
| Type | Unsanded, acrylic |
|---|---|
| Joint Width | Up to an eighth of an inch |
| Weight | 5.5 oz |
| Color | White |
| Unique Feature(s) | Easy-to-use tube shape |
| Product | Best | Type | Joint Width | Weight | Color | Unique Feature(s) |
|---|---|---|---|---|---|---|
| Custom White Dry Non-Sanded Grout | Budget-Friendly | Non-sanded cement | Up to 1/8″ | ANSI A118.6 | White | Low cost, delicate-tile safe |
| SimpleFix Alabaster Pre-Mixed | Pre-Mixed Grout | Sanded | 1/16 to 3/8″ | 2.09 lbs | White or grey | Pre-mixed |
| Bostik Dimension StarGlass Grout | Glass Tiles | Pre-mixed urethane | 1/16 – 1/2″ | 9 lbs | Silver (many available) | Light-reflective glass beads |
| Laticrete SpectraLock Pro Premium | Durable | Epoxy | 1/16 – 1/2″ | 9 lbs | White | High-quality materials and results |
| Red Devil Tile Squeeze Tube | Small Repairs | Unsanded, acrylic | 1/8″ | 5.5 oz | White | Easy-to-use tube shape |
Caring for Your Shower Grout
Even the best grout needs upkeep, because soap scum and hard-water deposits build up fast and feed mold. Skip harsh acids and bleach on colored cement grout, since they strip the sealer and fade the color over time. Use a pH-neutral cleaner or a mild vinegar solution, rinse well, and run the fan after showers to dry the joints. For cement grout, reseal once the original sealer wears, usually about once a year, to keep water out.
FAQs
Final Thoughts
Match the grout to the job and the rest gets easy. For a first DIY shower, a polymer-modified cement or a pre-mixed urethane is the most forgiving route. If you are building a shower you never want to touch again, the extra cost and care of epoxy pays off in a joint that stays waterproof for the long haul.
Whatever you pick, the prep decides the result more than the product does. Clean the joints, mix or tool the grout properly, and seal it if the formula calls for it. Do that and the work holds up for years.
