Products : Grout : Grout Additives : StainBlocker for Grout

StainBlocker for Grout

StainBlocker for Grout is a sealing and performance enhancing additive to be used when mixing grout and water. Unlike traditional sealers, which are applied to grout after it has dried for 2-3 days, StainBlocker for Grout is added directly to the grout mix during installation, to immediately repel dirt and make cleanup easier after the grout is dry. StainBlocker for Grout will not affect grout color.

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Key Features

  • Protects grout from staining
  • Use with water when mixing grout
  • Makes grout stronger


  • Use as a grout additive with any standard Portland cement-based grout
  • Easy to use – just add when mixing grout and water
  • GROUT TYPES: Use with all standard Portland cement-based grouts
  • Can use with both sanded and non-sanded grouts
  • For optimal performance use Polyblend® Grouts


  • Seals and enhances performance of the grout
  • Added directly to the grout mix during installation
  • Immediately repels dirt and makes clean-up easier after the grout is dry
  • Will not affect grout color


Applicable Standards

American National Standards Institute (ANSI) ANSI A108.10 and A118.6 of the American National Standards for the Installation of Ceramic Tile.

ASTM International (ASTM) - ASTM C627 Standard Test Method for Evaluating Ceramic Floor Tile Installation Systems Using the Robinson-Type Floor Tester.

Tile Council of North America (TCNA) - TCNA Handbook for Ceramic Tile Installation, TCNA Method EJ171

Environmental Consideration

Custom® Building Products is committed to environmental responsibility in both products produced and in manufacturing practices.

General Surface Prep

USE CHEMICAL-RESISTANT GLOVES, such as nitrile, when handling product.

Please follow grout manufacturer recommendations.

Health Precautions

Avoid eye and skin contact. If eye contact occurs, immediately flush with water for 15 minutes and consult a physician. If skin contact occurs, wash immediately with soap and water. Dried material becomes extremely difficult to remove. Keep out of reach of children. Do not take internally.

Limitations to the Product

  • Should only be used as a grout additive and not an independent sealer.
  • Only to be used with standard Portland cement based grouts
  • Not for use with an epoxy or other grout systems

Mixing Procedures

32 oz (946 ml) Mixing Instructions:

FOR USE WITH 25 LB (11.34 KG) POLYBLEND® SANDED GROUT. This additive replaces 32 oz (946 ml) of the water needed for your Polyblend® Grout.

FOR USE WITH 10 LB (4.5 kg) POLYBLEND® NON-SANDED GROUT. This additive replaces 12 oz (354 ml) of the water needed for your Polyblend® Grout. Do not use the full amount of water listed on bag.

12 oz (354 ml) Mixing Instructions:

FOR USE WITH 7 LB (3.17 KG) AND 10 LB (4.5 KG) POLYBLEND® SANDED AND NON-SANDED GROUT. This additive replaces a portion of the water needed to mix your Polyblend® Grout. DO NOT use the full amount of water listed on grout package.

Mix StainBlocker for Grout with water according to the table below:

* Up to 2 oz (59 ml) of additional water may be added to reach desired consistency

** Up to 4 oz (118 ml) of additional water may be added to reach desired consistency

Drying Time

Please follow grout manufacturer's recommended drying time.

Cleaning of equipment

Clean with soap and water before material dries. Cured material is difficult to clean from surfaces.


Keep from freezing.

Product Maintenance

Clean with a neutral cleaner such as Aquamix AquaKleen or Tilelab Grout & Tile Cleaner

Ordering Information


  • 12 oz (354 ml) bottle
  • 32 oz (946 ml) bottle

Warranty Information

Product Warranty

Custom® Building Products warrants to the original consumer purchaser that its product shall be free from defects in material and workmanship under normal and proper usage for a period of one year following the date of original purchase. Custom's® sole liability under this warranty shall be limited to the replacement of the product. Some states, countries or territories do not allow the exclusion or limitation of incidental or consequential damages, so the above limitation or exclusion may not apply to you. This warranty will not extend to any product which has been modified in any way or which has not been used in accordance with Custom's® printed instructions. Custom® makes no other warranties either expressed or implied. This warranty gives you specific legal rights, and you may have other rights that vary from state to state or from one country/territory to another.  This warranty is not transferrable.

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