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

Home Up Catalog Front Catalog Back Bob O'Brill Feedback Site Map Search

Patch-Rite     |    Products     |     Manufacturers     |     Price Guide     |     News





NO. 376


Provides high water retention...excellent curing qualities in quick, easy and economical to apply formulations.

SEALTIGHT CS-309/30-CLEAR Concrete Curing Compound is a high-solids content material developed for single application curing and sealing.

Technical Description
SEALTIGHT CS-309/30-CLEAR Concrete Curing Compound offers a 30% solids content. CS-309/30-CLEAR is a non-yellowing compound composed of a special blend of acrylic resins modified to provide excellent water retention. CS-309/30-CLEAR can be quickly, easily and economically applied wherever excellent curing is desired. Once properly applied, CS-309/30-CLEAR provides an impermeable seal yielding superior curing efficiency.

Concrete, properly cured with CS-309/30-CLEAR, offers a hard, dense surface minimizing hair-checking, thermal cracking, dusting and other defects. Properly cured concrete surfaces offer greater resistance to abrasion and corrosive action of salts and chemicals... excessive shrinkage is minimized. Both compressive and tensile strengths are increased for greater resistance to cracking and surface crazing.

CS-309/30-CLEAR 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.

SEALTIGHT CS-309/30-CLEAR Concrete Curing Compound may be used wherever it is desirable to apply a high-solids content material to effectively cure horizontal and vertical concrete surfaces. Ideal for exterior application.

Features and Benefits

bulletProduces an impermeable seal yielding superior curing efficiency
bulletCures, hardens, dustproofs and seals concrete in one application
bulletMinimizes hair-checking, thermal cracking, dusting and other defects
bulletImproved resistance to abrasion, corrosive salt action and chemicals
bulletMinimizes excessive shrinkage
bulletIncreases both compressive and tensile strengths for greater resistance to cracking and surface crazing
bulletApplies quickly, easily and economically

Application Tools

Power Sprayer



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-309/30 should be applied when surface water has completely disappeared and the concrete surface will not be marred by walking workmen.

APPLICATION METHOD...Use a power sprayer or short-nap roller to apply a uniform, even film. Avoid puddling in low areas.

SEALTIGHT CS-309/30 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).

SEALTIGHT CS-309/30 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-309/30 be applied at right angles. Additional coats of CS-309/30 may be applied after the first coat has thoroughly dried; naturally, this may vary depending on temperature, humidity and project conditions.

DRYING TIME...CS-309/30 dries quickly on new concrete...drying times may be extended on previously cured, new concrete and on old concrete. Restrict foot traffic for at least four (4) hours...12 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.


5 gallon (18.93 liter) Pails
55 gallon (208.20 liter) Drums

200-600 ft./gal. (4.91-14.73m/L), depending on surface finish

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


HEALTH HAZARDS: Direct contact may cause skin and/or eye irritation. Inhalation of vapors may cause transient central nervous system depression. This product should not be utilized in locations where food items are present.

CS-309/30 is combustible (flash point 105F). Remove ignition sources prior to utilizing product. Do not apply CS-309/30 if the temperature of the concrete is below 40F (4C) and only after all surface water has disappeared.

CS-309/30 can be used on colored concete, but mottling may occur. Do not use on brick, stone, masonry, slate, etc., which are not uniform in porosity or have a non-porous surface. Concrete containing calcium chloride will remain dark longer when treated with CS-309/30. The specifier and user shall determine 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 February, 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

Send mail to webmaster@obrillcompany.com with questions or comments about this web site.
Copyright 2002 O'Brill Company
Last modified: August 09, 2004