Product #

A water-based, penetrating grout sealer that provides advanced stain and Microban® antimicrobial product protection.


Product Overview

Now with Microban® antimicrobial technology! STONETECH® Heavy Duty Grout Sealer is a water-based penetrating grout sealer that offers advanced stain and antimicrobial product protection on grout surfaces. Designed to keep grout looking newer longer, it protects against oil and water-based stains and inhibits the continuous growth of bacteria, mold and mildew.

STONETECH Heavy Duty Grout Sealer is a natural look water-based grout sealer that does not alter the appearance of the grout. A safer professional grade solution for you and the environment when compared to high VOC solvent-based sealers. Use this grout sealer to inhibit growth of mold on grout. Great for use on sanded and non-sanded cement based grouts with natural stone, tile, and masonry surfaces in interior and exterior applications. Comes with a 25-year satisfaction guarantee.

Features & Benefits

  • Advanced Stain Protection - Offers heavy duty protection against oil and water-based stains
  • Microban® Antimicrobial Technology - Inhibits the continuous growth of bacteria, mold and mildew§ 
  • Penetrating, Natural Look Sealer - Preserves the original look of the grout
  • Water-Based Formula - Better for you and the environment
  • Low odor, non-flammable, weather resistant - Great for interior and exterior use
  • §Antimicrobial technology is not designed to protect users against disease causing microorganisms. Normal cleaning practices should be maintained.

Product Specifications


Product # ST306-XXXX
Patent #(s)
Available Colors
Part of System LATICRETE®
Country Availability Canada, United States
Substrates Grout, Grout
Packaging Summary


ST306-1202: 2 fl oz (59 mL) Sample - 12 units / case

ST306-0624: 24 fl oz (709 mL) Spray Bottle - 6 units / case

ST306-0632: Quart /32 fl oz (946 mL) Bottle - 6 units / case

ST306-0401: Gallon /128 fl oz (3.8L) Bottle - 4 units / case


ST349-1216: Pint /16 fl oz (473 mL) Bottle - 12 units / case


Available Warranties

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