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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Sealtight Seal Cure CS-309-25




NO. 375


SEALTIGHT SEAL CURE-309-25 is a clear, ready-to-use formula of styrene-acrylic polymers and quick evaporating solvents, which cures, seals, hardens and dustproofs freshly placed concrete surfaces, newly cured bare concrete and improves the wearability of aged concrete surfaces. SEAL CURE-309-25 meets maximum VOC content limit of 700 g/L for Concrete Curing and Sealing Compounds as required by the U.S. EPA Architectural Coatings Rule.

When properly applied, SEAL CURE-309-25 provides an impermeable seal for efficient moisture retention, producing harder denser concrete. It also provides a durable, long-lasting moisture impermeable finish that improves resistance to chemicals, oil, grease, de-icing salts and abrasion. The use of SEAL CURE-309-25 will help minimize hair checking as well as premature cracking, dusting, spalling and other common defects that result when the concrete is not properly cured, or the workmanship, air entrainment and water/cement ratios vary. SEAL CURE-309-25 is easy and economical to use and apply. It dries quickly to protect new exterior concrete surfaces during construction. When used on existing concrete surfaces, SEAL CURE-309-25 restores the concrete like new. A properly prepared and cleaned concrete surface (in accordance with good concrete maintenance practices) will appear newer & brighter and is easier to clean and maintain.

SEALTIGHT SEAL CURE-309-25 may be used on freshly placed and finished exterior concrete surfaces, aged concrete surfaces, exposed aggregate, brick floors, terrazzo, concrete walls and horizontal surfaces. It is ideal for use on industrial & commercial concrete surfaces, sidewalks, parking decks, driveways, etc., or any place a medium-sheen finish is desired. If a higher-sheen finish is desired, a second coat may be applied. SEAL CURE-309-25 may discolor. We recommend that when a completely non-yellowing cure & seal is required, use SEALTIGHT CS-309-25 Non-Yellowing Curing & Sealing Compound. SEAL CURE-309-25 can be applied to colored concrete, but mottling may occur.

Features and Benefits

bulletCures & seals new concrete in one application
bulletProduces an impermeable seal yielding superior curing efficiency
bulletProvides a durable, long-lasting, moisture resistant medium sheen film finish that improves resistance to chemicals, oil, grease, deicing salts and abrasion
bulletMinimizes hair checking, cracking, spalling and other common defects of improperly cured concrete
bulletRestores & seals aged concrete like new
bulletPermits easy clean up and housekeeping...reduces maintenance costs


Physical Properties

Appearance: Clear
Solids Content: 26%
Weight/gallon: 7.25 lbs.
Flash Point: 106 °F (41 °C)
Acid & Alkali Resistance: Good
Wearing Quality: Good


275 gallon mini-totes (1040.99 liters)
55 gallon drums (208 liters)
5 gallon pails (18.9 liters)

Coverage Rate: 200-600 ft2/gal., depending on surface finish
Shelf Life: 1 year in unopened, unused container.

ASTM C 309, Type 1, Class B
ASTM C 1315, Type I, Class B
AASHTO M 148, Type 1 Class B

SURFACE PREPARATION...Old Concrete: Concrete surfaces must be clean and dry, with all stains, oil, grease, dust and dirt removed prior to application. New Concrete: SEAL CURE-309-25 should be applied when the surface water has completely disappeared and the concrete surface will not be marred by walking workmen.

APPLICATION METHOD...Use a sprayer or short nap roller to apply a uniform, even film. Avoid puddling in low areas. Standard garden-type sprayers, equipped with a neoprene hose and gaskets are recommended for best results.

SEAL CURE-309-25 should not be applied during high temperature conditions in direct sunlight. These conditions cause rapid evaporation, which does not allow the film to form properly. Under these conditions, the film may peel, bubble and/or turn white (blush).

SEAL CURE-309-25 should not be applied to concrete exposed to excessive moisture. Entrapped moisture in a solvent based sealer may cause the film to peel and/or turn white (blush).

NOTE...For added protection and a greater sheen on new or old concrete, we recommend (2) coats of SEAL CURE-309-25 be applied at right angles. Additional coats of SEAL CURE-309-25 may be applied after the first coat has thoroughly dried; naturally, this may vary depending on temperature, humidity and project conditions.

DRYING TIME...SEAL CURE-309-25 dries quickly. Drying times may be extended; again, depending on temperature, humidity and project conditions. Restrict foot traffic for at least 4 hours…twelve (12) hours is preferable

NOTE...SEAL CURE-309-25 dries quickly. Drying times may be extended; again, depending on temperature, humidity and project conditions. Restrict foot traffic for at least 4 hours…twelve (12) hours is preferable.

Application equipment should be cleaned promptly after use with Xylene or Toluene.

DO NOT DILUTE. SEAL CURE-309-25 IS FOR EXTERIOR APPLICATION ONLY. Do not apply SEAL CURE-309-25 if the temperature of the concrete is below 40°F (4°C). Do not paint or apply resilient flooring over SEAL CURE 309-25 without first checking the specifications and securing the approval of the paint or resilient flooring manufacturer. SEAL CURE-309-25 may be used on colored concrete, but mottling may occur. Do not use on non-porous surfaces or surfaces which are not uniform in porosity, i.e. brick, stone, masonry, etc. Concrete containing calcium chloride will remain dark longer when treated with SEAL CURE-309-25. The specifier and user shall determine the suitability of product for specific applications and assume all responsibility in connection therewith.

Refer to Material Safety Data Sheet for complete Health and Safety Information.

This material last updated November, 2001.


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