Product Data Sheet
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Non-Yellowing, Acrylic Curing and Sealing Compound
CS-309-25 OTC acrylic curing and sealing compound is a clear, transparent, ready-to-apply, non-yellowing liquid compound formulated with special acrylic polymers and VOC-exempt solvents that effectively cures and seals freshly placed concrete.
Once properly applied, CS-309-25 OTC provides a premium-grade seal for optimum moisture retention. CS-309-25 OTC will minimize hair checking as well as premature cracking, dusting, spalling, and other common defects that result when concrete is not properly cured. This easy-to-use compound dries quickly and protects the concrete during construction.
CS-309-25 OTC is can be used 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. The use of CS-309-25 OTC on any exterior concrete surface provides a durable, long-lasting finish that offers improved resistance to chemicals, oil, grease, de-icing salts, and abrasion. CS-309-25 OTC provides an attractive, glossy finish that enhances the natural appearance of the concrete.
For interior applications, specify and apply VOCOMP®-20 or VOCOMP-25 curing and sealing compound from W. R. MEADOWS.
- Provides a totally clear membrane for new or existing concrete.
- Permeable film allows moisture in cured concrete to evaporate.
- Provides a tough, durable, uniform, premium-grade, long-lasting film on exterior concrete surfaces.
- Ultraviolet stable; non-yellowing under extreme exposure.
- Cures and seals freshly placed concrete simultaneously in one application.
- Produces a premium-grade film, yielding optimum moisture retention.
- Minimizes hair checking, cracking, dusting, spalling, and other defects common to improperly cured or uncured concrete.
- Provides improved resistance to chemicals, oil, grease, and de-icing salts.
- Produces a hard, glossy film that enhances the natural appearance of concrete.
- Applies easily … dries quickly for less downtime.
- Permits easy cleanup … reduces floor maintenance costs.
- VOC compliant.
1 Gallon Cans (4/Carton)
5 Gallon Pails
55 Gallon Drums
300 – 600 ft.2/gal. Coverage is approximate and may vary depending on surface finish/texture, concrete condition, climatic conditions, etc. Always apply to a test area first to determine actual coverage rate before full-scale application.
When stored indoors in original, unopened containers at temperatures between 40° – 90° F, optimum performance and best use is obtained within two years of date of manufacture.
- AASHTO M 148, Type 1, Class A & B
- ASTM C309, Type 1, Class A & B
- ASTM C1315, Type I, Class A
- Complies with National AIM, LADCO, and Phase I OTC states VOC regulations.
- Dried film is USDA accepted
Fresh (New) Concrete … Apply as soon as all surface water has disappeared and the concrete surface will not be marred by walking workers.
Existing (Old) Concrete … Concrete surface must be clean and dry with all stains, oil, grease, dust, dirt, and curing compounds removed prior to application.
Application Method … Use a sprayer or short-nap roller to apply a uniform film. Avoid puddling in low areas. If puddles occur, brush or roll them out. A standard industrial-grade sprayer, such as a Chapin 19069, equipped with Viton fittings and a spray nozzle that produces a flow of 0.5 GPM (1.9 LPM) under 40 psi (0.276 MPa) of pressure is recommended.
For full application guidelines, please visit https://www.wrmeadows.com/construction-liquids/application-guidelines-otc-curing-sealing-compounds/.
Mixing … For optimum performance, gentle mixing or agitation is recommended. CAUTION: TO AVOID FOAMING, DO NOT MIX EXCESSIVELY.
Drying Time … Product dries quickly. Drying times will vary depending on application rate, temperature, humidity, and project conditions. Restrict foot traffic for at least four hours. Twelve hours is preferable.
Cleanup … Clean tools after use with a solvent such as xylol, toluol, or SEALTIGHT® CLEANER from W. R. MEADOWS.
Coating is to be applied without dilution or thinning. For exterior application only. Block all HVAC ventilation ducts which may spread product odor. Use with adequate ventilation and keep away from open flame. If odor is objectionable, use of DECRA-SEAL™ W/B or the VOCOMP® series from W. R. MEADOWS is suggested. Surfaces treated with CS-309-25 OTC may become slippery under certain conditions. To increase slip resistance, add SURE-STEP™ additive from W. R. MEADOWS to the product.
Product 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). Surface temperature of the concrete must be between 40° – 90° F (4° – 32° C).
Product 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). Over application may result in the finished film appearing hazy or white.
Product may be used on colored concrete, but mottling may occur. Do not use on dense or non-porous surfaces, i.e. brick, stone, etc. Concrete containing calcium chloride will remain dark longer when treated with this product.
HEALTH AND SAFETY
Prolonged inhalation of vapors in excess of permissible exposure limits may result in symptoms of transient central nervous system depression. Direct contact with the product may result in irritation of the skin and eyes. Product vapors may also cause irritation. CS-309-25 OTC is flammable. Remove ignition sources prior to use. Empty containers may hold flammable vapors. Handle empty containers as flammable 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. Refer to Safety Data Sheet for complete health and safety information.
May help contribute to LEED credits:
- MRc9: Construction and Demolition Waste Management