O'Brill Company

Construction Specialty Suppliers

       6626 N. Milwaukee Ave.

Niles, IL 60714

773-775-1122 or 847-647-0005

FAX 847-647-7819

Since 1967

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NO. 378


SEALTIGHT LIQUI-HARD increases density, dustproofs and hardens the concrete to enhance resistance to moisture and other foreign matter.

Technical Description
SEALTIGHT LIQUI-HARD Concrete Densifier and Chemical Hardener Compound is a ready-to-use, colorless liquid concentration of 100% active chemicals that deeply penetrate the surface of concrete. SEALTIGHT LIQUI-HARD is specifically designed to produce hardened, dustproofed and improved chemically-resistant surfaces wherever it is applied.

Through a chemical ion exchange process, LIQUI-HARD penetrates progressively through the concrete and chemically solidifies all the component parts into a homogenous concrete mass. Besides its densifying and hardening action, LIQUI-HARD solidifies the concrete eliminating dusting, rotting and pitting.

LIQUI-HARD meets maximum VOC content of 400 g/L for Concrete Protective Coatings as required by the U.S. EPA Architectural Coatings Rule.

LIQUI-HARD is recommended for use wherever hardening, dustproofing and improved chemically resistant surfaces are required. Ideal applications include floors in industrial plants and warehouses, storage silos, sewage plants, chemical processing facilities, refineries and heavy pedestrian floor traffic areas such as civic centers, sports arenas, stadiums, hospitals, airports and museums. It also provides an excellent protective treatment for preventing oxidation of iron aggregate floors.

Advantages and Benefits

bulletPenetrates deeply into concrete to densify and harden surfaces to prevent entry of moisture and other foreign matter
bulletDustproofs and improves chemical, petroleum and abrasion resistance of treated surfaces
bulletPrevents oxidation of iron aggregate floors
bulletProtects against scratching or peeling
bulletProvides tough protected surface that wont after-yellow, discolor or show pedestrian or vehicular traffic wear marks
bulletVOC-compliant...meets the U.S. EPA Architectural Coatings Rule requirements
bulletReady-to-use from container and easy-to-apply

5 gallon (18.93 liter) Pails
55 gallon (208.2 liter) Drums

Application Tools



Soft Bristle Broom

Mechanical Scrubber

Surface Preparation
NEW CONCRETE: On newly poured concrete, wait for a minimum of 72 hours prior to the application of LIQUI-HARD. Clean surfaces of all curing compounds, residue, oil, sealers, waxes, contaminants and laitance before applying.

OLD CONCRETE: Surfaces should be clean and structurally sound. Remove all residue, oil, sealers, waxes, contaminants and laitance. SEALTIGHT ULTRITE Degreaser may be used (refer to Product Data Sheet number 379-PD). Fill all holes, cracks and deteriorated areas that have been removed to sound concrete.

Application (for NEW and OLD concrete surfaces)
NOTE: SEALTIGHT LIQUI-HARD is ready to use "as-is" from the container.

Saturate surface with undiluted LIQUI-HARD by sprayer, squeegee or brooming. While keeping surfaces wet with LIQUI-HARD, scrub surface with a bristle broom or mechanical scrubber until material gels (approx. 45 minutes). Wet material lightly with water. Continue to work it into the surface for another 5 to 10 minutes. Flush surface with water, removing any excess material with mop or sqeegee. On porous surfaces, repeat with a second application as above.

WARNING: Failure to thoroughly wash and remove all excess material from floor surfaces may result in unsightly white stains. Immediately wash off over-spray from glass, aluminum, or highly polished surfaces with water to avoid etching of surfaces.

DRYING TIME: 2 to 4 hours. LIQUI-HARD dries very quickly on new, virgin concrete, drying times may be extended on old concrete due to surface conditions. Restrict foot traffic for at least 4 hours, 12 hours is preferable.

Application Rate ft./gal.
Broomed: 200-300 
Troweled:  300-500
Fresh:  200-300
Old:  150-250 

CLEAN-UP: While still wet, equipment may be cleaned quickly and easily with soap and water. Do not allow LIQUI-HARD to dry before flushing excess from surfaces.

Use material "as is" in the container. DO NOT DILUTE. Do not apply if the temperature of the concrete is less than 35F (2C) or above 135F (57C). KEEP FROM FREEZING.

HEALTH HAZARDS: LIQUI-HARD is non-combustible (flash point > 210F). Direct contact will result in irritation of the skin and eyes. Inhalation of product mist may result in respiratory irritation.
Refer to Material Safety Data Sheet for complete health and safety information.

This material last updated January, 2000.


W. R. MEADOWS, INC. warrants that, at the time and place we make shipment, our materials will be of good quality and will conform with our published specifications in force on the date of acceptance of the order. THE FOREGOING WARRANTY SHALL BE EXCLUSIVE AND IN LIEU OF ANY OTHER WARRANTY, EXPRESS OR IMPLIED, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE AND ALL OTHER WARRANTIES OTHERWISE ARISING BY OPERATION OF LAW, COURSE OF DEALING, CUSTOM OF TRADE OR OTHERWISE. As the exclusive remedy for breach of this Warranty, we will replace defective materials, provided, however, that the buyer examine the materials when received and promptly notify us in writing of any defect before the materials are used or incorporated into a structure. Three (3) months after W. R. MEADOWS, INC. has shipped the materials, all our Warranty and other duties with respect to the quality of the materials delivered shall conclusively be presumed to have been satisfied, all liability therefore terminates, and no action for breach of any such duties may thereafter be commenced. W. R. MEADOWS, INC. shall in no event be liable for consequential damages. Unless otherwise agreed to in writing, no warranty is made with respect to materials not manufactured by W. R. MEADOWS, INC. We cannot warranty or in any way guarantee any particular method of use or application of the performance of materials under any particular condition. Neither this Warranty nor our liability may be extended or amended by our salesmen, distributors or representatives, or by our distributor's representatives, or by any sales information or drawings.

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Copyright 2002 O'Brill Company
Last modified: August 09, 2004