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)

Cures and seals freshly placed concrete in one economical operation.

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.

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

bulletProvides an economical, non-yellowing, durable, tough, uniform, moisture-impermeable, long-lasting film finish on exterior concrete surfaces
bulletCures and seals freshly placed concrete simultaneously in one application
bulletProduces an impermeable seal yielding efficient moisture retention
bulletMinimizes hair-checking, cracking, dusting, spalling and other defects common to improperly-cured concrete
bulletResists discoloration or yellowing due to ultraviolet degradation
bulletProvides improved resistance to chemicals, oil, grease, deicing salts and abrasion during construction
bulletProvides an attractive sheen that enhances the natural appearance of concrete
bulletApplies easily and dries quickly for less downtime
bulletPermits easy cleanup and housekeeping and reduces floor maintenance costs
bulletVOC compliant...meets the U.S. EPA Architectural Coatings Rule requirements

Application Tools



Short-Nap Roller

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: CS-309-25 should be applied when 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.

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.

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

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

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

200 to 600 ft./gal. (4.91 -14.73m/L), depending on surface finish.
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 40F (4C). 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.


Home Up 1100 - Clear Series 1200 - White 1300 - Clear 1600 - White 164 588 Precision Grout Ceramar Cera-Rod CG-86 Control Joints CS-309-25 CS-309-30 Deck-O-Foam Direct Fire Parking Sealant Duogard Duogard II Evapre Expo-Gloss Fibre Expansion Joint Gardox Hi-Spec Hydraset Hydraset-Free Intralok Lin-Seal Lin-Seal Emulsion Lin-Seal White Liqui-Hard Meadow-Plug Med-Cure Mel-Dek Mel-Drain DB Mel-Gard Melnar Mel-Prime SB VOC Mel-Prime WB Mel-Rol Pac-It Plastic Joint Materials Pourthane Premoulded Membrane Premoulded Tongue and Groove Protection Course PVC Waterstops Red Rosin Paper Rezi-Weld 1000 Rezi-Weld 3-2 Rezi-Weld Gel Paste State Rezi-Weld Gel Paste Rezi-Weld LV Rezi-Weld Rapid Set Roof Traffic Pads Sealex Sealmastic Sealmastic Emulsion Sealtight 1190 Sealtight 158 Sealtight 3405 Sealtight Acry-Lok Sealtight Air-Shield Sealtight CR-90 Sealtight Deck-O-Seal Sealtight Futura-15 Sealtight Kool-Rod Sealtight Meadow-Crete FNP Sealtight Meadow-Crete GPS Sealtight Meadow-Crete H2 Sealtight Meadow-Patch 20 Sealtight Meadow-Patch 5 Sealtight Meadow-Patch T1 Sealtight Meadow-Patch T2 Sealtight Patch-Prime Sealtight Poly-Grip Sealtight Poly-Jet 1614 Sealtight Poly-Jet 200-E Sealtight Poly-Jet 3406 Sealtight Premoulded Membrane Sealtight Rezi-Weld Flex Sealtight Safe-Seal 3405 Sealtight Sealex E-Z Sealtight Ultrite Degreaser Sealtight Seal Cure CS-309-25 Sewer Joint Sof-Seal Tiah Vibraflex Vocomp-20 Vocomp-25 Vocomp-30

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