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. 361

CS-309-25™ (formerly CS309-1315)

NON-YELLOWING ACRYLIC CURING AND SEALING COMPOUND
Cures and seals freshly placed concrete in one economical operation.

Description
SEALTIGHT CS-309-25 Acrylic Curing and Sealing Compound is a clear, transparent, ready-to-apply, non-yellowing liquid compound formulated from special acrylic copolymers and quick-evaporating solvents that effectively cure and seal freshly placed concrete economically.

CS-309-25 meets maximum VOC content limits of 700 g/L for Concrete Curing and Sealing Compounds as required by the U.S. EPA Architectural Coatings Rule.

Once properly applied, CS-309-25 provides an impermeable seal for efficient moisture retention. This produces a hard, dense, high-compressive strength concrete. CS-309-25 will minimize hair-checking as well as premature cracking, dusting, spalling and other common defects that result when concrete is not properly cured. This economical, easy-to-use compound dries quickly and protects the concrete during construction. It resists adhesion of mortar droppings and permits easier clean-up. CS-309-25 also resists discoloration or yellowing due to ultraviolet degradation.

Uses
SEALTIGHT CS-309-25 is ideal for application on commercial and industrial concrete surfaces, sidewalks, patios, multi-level parking decks, driveways, and parking areas... wherever you want to simultaneously cure and seal exterior concrete surfaces. For interior applications, specify and apply SEALTIGHT VOCOMP-20 or VOCOMP-25 Curing and Sealing Compounds. (Refer to Data Sheet No. 368 & 369).

The use of CS-309-25 on any exterior concrete surface provides a durable long-lasting finish that has improved resistance to chemicals, oil, grease, deicing salts and abrasion. CS-309-25 provides an attractive, low sheen finish that enhances the natural appearance of the concrete. If a higher sheen is desired, a second coat of CS-309-25 or a coat of TIAH may be applied.

Complete System to Cure and Seal Concrete
For optimum protection of new exterior surfaces, use CS-309-25 to initially seal and cure the concrete. Then apply TIAH Non-Yellowing Acrylic Concrete Sealer. Refer to Data Sheet No. 364.

Features and Benefits

Application Tools

CS-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).

CS-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 CS-309-25 or a coat of TIAH be applied at right angles. Additional coats may be applied after the previous coat has thoroughly dried; naturally, this may vary depending on temperature, humidity and project conditions.

DRYING TIME...CS-309-25 dries quickly. Drying times may be extended; again, depending on temperature, humidity, and project conditions. Restrict foot traffic for at least four hours...twelve hours is preferable.

NOTE: Use of fillers, extenders or additives in the concrete mix can result in a higher than normal porosity. To provide proper surface treatment, adjust coverage ratios to compensate for the resulting penetration.

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

Packaging
1 gallon (3.79 liter) cans (6 per case)
5 gallon (18.93 liter) Pails
55 gallon (208.20 liter) Drums

Specifications
ASTM C 309, Type 1, Class B
ASTM C 1315, Type I, Class A
AASHTO M 148, Type 1 Class B
USDA Accepted

Coverage
200 to 600 ft.²/gal. (4.91 -14.73m²/L), depending on surface finish.
.
Precautions
DO NOT DILUTE. CS-309-25 IS FOR EXTERIOR APPLICATION ONLY. Do not apply CS-309-25 if the temperature of the concrete is below 40ºF (4ºC). CS-309-25 may be used on colored concrete, but mottling may occur. Do not paint or apply resilient flooring over CS-309-25 without first checking the specifications and securing the approval of the paint or resilient flooring manufacturer. Do not use on non-porous surfaces which are not uniform in porosity, i.e. brick, stone, masonry, etc. Concrete containing calcium chloride will remain dark longer when treated with CS-309-25. The specifier and user shall determine the suitability of product for specific applications and assume all responsibility in connection therewith.

Health Hazards
Prolonged inhalation of vapors in excess of permissable exposure limits may result in symptoms of transient central nervous system depression. Direct contact with the product may result in the irritation of the skin and eyes. Product vapors may also cause irritation. CS-309-25 is combustible. Remove ignition sources prior to use. Empty containers may hold combustible liquids. In the event of a spill, contain the product; apply absorbents and place in sealed containers. In the event of a fire, contain all run-off water.

This material last updated December, 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