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Looking for the best grout additive to enhance your tiling projects? The right grout additive can boost durability, improve flexibility, and protect against stains and moisture.
In 2025, there are top-rated options that offer enhanced performance for a longer-lasting finish, along with our top 2 choices, this guide features the best grout additives to help you achieve professional results and maintain beautiful tiles for years to come.
Our Top Picks:
Which Grout Additive is the Best?
Grout additives protect against cracking, moisture, and staining, especially in high-use areas like kitchens and bathrooms. They help keep grout clean and prevent mold and mildew by repelling water and stains.
The main benefit of using a grout additive is added durability and resistance to stains and moisture, leading to a longer-lasting, cleaner grout finish with fewer repairs.
Choose a grout additive compatible with your grout type and consider its area of use. For moisture-prone areas, look for mildew resistance; in kitchens, opt for stain resistance. If you’re using colored grout, find an additive that maintains color over time and is easy to apply.
To create this list of the best grout additives of 2025, we reviewed top grout additives based on performance, user feedback, and expert recommendations. We evaluated compatibility, value, and effectiveness to ensure each product meets common grout needs.
Best Overall
Omni Grout Additive
Pros:
- Strong stain protection from water and oil.
- Works with both sanded and non-sanded grout.
- No need for additional sealers, saving time.
Cons:
- Slightly more expensive than using water.
- Limited to cement grout applications.
Omni Grout Additive is formulated for a 10-pound bag of sanded cement grout and provides robust protection against water and oil stains.
With its water-based formula, it enhances grout durability and stain resistance, making it ideal for both sanded and non-sanded grout applications.
Key Features:
- Shields grout from water and oil stains for lasting results.
- Innovative technology that’s easy to use and environmentally friendly.
- Works well with both types, ensuring versatility.
- Simply replace water with the additive during grout preparation.
- Offers long-lasting performance and resistance to stains.
Best Grout Additive for Shower
STONETECH GroutUp Additive
Pros:
- Advanced stain resistance for water and oil.
- All-in-one grout, seal, and protect solution.
- Eco-friendly, water-based formula.
Cons:
- Not ideal for high-traffic or exterior areas.
- Requires precise mixing.
STONETECH GroutUp Additive integrates advanced protection against water and oil-based stains into a convenient, all-in-one grout solution. This additive saves time and effort by sealing, protecting, and enhancing grout in a single step.
Key Features:
- Guards against water and oil-based stains.
- Grout, seal, and defend in one application.
- Water-based formula that is safer for both you and the environment.
- Streamlines installation by eliminating the need for separate sealing.
- Provides enduring stain resistance without added sealing steps.
Best Water Resistant Grout Additive
MAPEI Grout Additive
Pros:
- Stain-resistant, easy-to-clean grout.
- No need for extra sealing.
- Water-resistant for moisture-prone areas.
Cons:
- Higher cost than standard grout mixes.
- Requires exact measurements for consistency.
MAPEI Grout Additive creates a stain-resistant, easy-to-clean grout surface that simplifies maintenance. Designed to replace water in the mixing process, it ensures consistent grout color and reduces the need for future sealing.
Key Features:
- Keeps grout cleaner and resistant to dirt and stains.
- Saves time by eliminating a separate sealing step.
- Adds water resistance for improved durability in wet areas.
- One 26 oz bottle effectively treats a 10-pound bag of sanded grout.
- Simply mix with grout in place of water for a quick and effective application.
Customers Say:
Effective for pool tile and deck repairs, customers liked its sealing ability but noticed a slight chalkiness, resolved with direct painting on grout lines.
Best Grout Additive for Increased Flexibility
Damtite 05370 Grout Additive
Pros:
- Adds waterproofing for longer-lasting grout.
- Strengthens adhesion and durability.
- Multipurpose for various repair mixes.
Cons:
- Not necessary for non-waterproof applications.
- Limited availability in stores.
Damtite 05370 Grout Additive is designed to boost adhesion, strength, and longevity for grout, patch, and resurfacing mixes. This product is ideal for creating durable, long-lasting repairs that resist moisture.
Key Features:
- Provides enhanced moisture resistance for added durability.
- Increases adhesion and strength for robust, reliable repairs.
- Suitable for use in patch, grout, and resurfacing mixes.
- Delivers a more durable finish that withstands various conditions.
- Simply add to grout or patch mixtures for enhanced performance.
Customers Say:
Strongly bonds grout and is easy to apply, with added stain resistance; some customers reported packaging issues like expired or partially filled containers.
Best Grout Additive for Enhancing Durability
Miracle Sealants GRSHNI2 Grout Additive
Pros:
- Lifetime stain protection.
- Enhances color consistency in grout.
- Eliminates the need for separate sealing.
Cons:
- Higher upfront cost.
- Requires careful measuring.
Miracle Sealants GRSHNI2 Grout Additive combines sealer and color enhancement in one, designed to improve the look and longevity of grout without the need for additional sealing. It works well with sanded and non-sanded grout, enhancing strength, stain protection, and color uniformity.
Key Features:
- Provides a lifetime stain warranty, ensuring lasting performance.
- Increases compressive, tensile, and flexural strength for greater durability.
- Delivers more uniform color across grout lines.
- Resists moisture and stains for a longer-lasting grout finish.
- Eliminates the need for future sealing applications, saving time and money.
Customers Say:
Enhances grout strength and flexibility; most users found it helpful, though packaging inconsistencies like expired products were noted.
Best Grout Additive for Stain Resistance
BTG Mold Defense Grout Additive
Pros:
- Protects grout from mold and mildew.
- Non-toxic and safe for indoor use.
- Easy to mix with grout.
Cons:
- Less effective in outdoor environments.
- Doesn’t work well on pre-molded grout.
BTG Mold Defense Grout Additive is a non-toxic, easy-to-use grout additive that protects against mold and mildew buildup. Made in the USA, this product keeps grout looking fresh and is perfect for high-moisture areas like kitchens and bathrooms.
Key Features:
- Prevents mold and mildew, keeping grout cleaner for longer.
- Safe for indoor use and suitable for family-friendly environments.
- Works well in kitchens, bathrooms, and other tiled spaces.
- Easily integrates into wet grout for quick application.
- Produced in the USA, supporting domestic manufacturing.
Customers Say:
Highly effective against mold in grout, easy to mix, and even used outdoors for insect control; some say its mold resistance may be temporary.
Best Grout Additive for Ease of Application
Tenon Mighty Bond – Grout Additive
Pros:
- Increases strength and adhesion.
- Cold weather safe.
- Versatile for concrete, grout, and tile.
Cons:
- Higher cost than basic mixes.
- Requires precise mixing for best results.
Tenon Mighty Bond Grout Additive enhances the durability and adhesion of concrete, mortar, grout, and patch mixes, offering improved workability and resistance even in cold weather. It’s ideal for use in challenging applications and supports long-lasting construction projects.
Key Features:
- Provides a psi of 1,910 after 28 days for superior durability.
- Maintains effectiveness even in freezing temperatures.
- Can be added to various mixtures including concrete, mortar, and grout.
- Suitable for setting ceramic, glass, or quarry tiles.
- Withstands harsh conditions, including exposure to salt and winter weather.
The Bottomline
In conclusion, selecting the best grout additive is essential for durable, long-lasting tile installations. The right additive enhances flexibility, stain resistance, and overall performance.
By choosing one of the top options from our list, you can ensure professional results and keep your tiles looking great for years. Investing in the best grout additive is a smart choice for maintaining the beauty and durability of your tiles.
