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WR Meadows CS-309-25 OTC 5 Gallon Pail
WR Meadows CS-309-25 OTC is a clear, non-yellowing acrylic curing and sealing compound formulated with VOC-exempt solvents in a 5 gallon pail. It is intended for freshly poured exterior concrete and dries to a glossy finish.
- Covers 300 to 600 sq ft per gallon
- Complies with National AIM, LADCO, and OTC Phase I and II VOC rules
- UV stable and non-yellowing, with a two-year shelf life
$239.83
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WR Meadows CS-309-25 OTC 5 Gallon Pail
WR Meadows CS-309-25 OTC is a clear, ready-to-apply acrylic compound formulated with VOC-exempt solvents to cure and seal freshly poured concrete in one application. It helps limit hair checking, dusting, and spalling, and it dries quickly to a hard, glossy film that raises resistance to chemicals, oil, grease, de-icing salts, and abrasion. It is for exterior use; WR Meadows specifies VOCOMP-20 or VOCOMP-25 for interior work. This 5 gallon pail covers roughly 1,500 to 3,000 sq ft.
Key Features
- VOC-exempt solvent formula for OTC-region compliance
- UV stable, non-yellowing clear membrane
- Permeable film lets moisture in cured concrete evaporate
- Hard, glossy film that shows the look of the concrete
- Cures and seals fresh concrete in one application
Applications
- Commercial and industrial exterior concrete
- Sidewalks, patios, and driveways
- Multi-level parking decks and parking areas
- Freshly poured concrete in OTC Phase II states
Technical Specifications
| Property | Value |
|---|---|
| Chemistry | Acrylic polymers in VOC-exempt solvents |
| Coverage | 300 to 600 sq ft/gal |
| Coverage per pail | About 1,500 to 3,000 sq ft |
| ASTM C309 | Type 1, Class A and B |
| AASHTO M 148 | Type 1, Class A and B |
| ASTM C1315 | Type I, Class A |
| VOC compliance | National AIM, LADCO, OTC Phase I and Phase II |
| Other | Dried film USDA accepted |
| Finish | Glossy |
| Foot traffic | At least 4 hours, 12 hours preferred |
| Concrete surface temperature | 40 to 90 F |
| Sprayer | Chapin 19069 with Viton fittings, 0.5 GPM at 40 psi |
| Shelf life | 2 years unopened, stored at 40 to 90 F |
| Pack | 5 Gallon Pail |
| Part number | 3515005 |
Product documents: WR Meadows CS-309-25 OTC Data Sheet (PDF)
Frequently Asked Questions
What does OTC mean on WR Meadows CS-309-25 OTC?
It is formulated with VOC-exempt solvents to comply with National AIM, LADCO, and OTC Phase I and Phase II VOC regulations. In states whose rules follow the OTC Phase II model, it may be used on fresh concrete as a curing and sealing compound but not as a sealer on existing, aged, or cured concrete.
What should be used on existing concrete instead?
For existing, aged, or cured concrete, WR Meadows recommends TIAH OTC or TIAH 100. For interior work, it specifies VOCOMP-20 or VOCOMP-25.
What coverage does the CS-309-25 OTC 5 Gallon Pail give?
300 to 600 sq ft per gallon, or roughly 1,500 to 3,000 sq ft for this 5 gallon pail. Test a small area first, since finish, texture, and conditions change the rate.
How is CS-309-25 OTC applied?
Apply once all surface water has disappeared and workers will not mar the surface. Mix gently, then use a sprayer or short-nap roller for a uniform film without puddles. A Chapin 19069 sprayer with Viton fittings and a 0.5 GPM nozzle at 40 psi is recommended. Do not dilute or thin it.
What conditions should be avoided with CS-309-25 OTC?
The concrete surface must be between 40 and 90 F. Avoid high heat and direct sun, excessive moisture, and over-application, any of which can leave the film hazy, peeling, or white.
What safety precautions apply to CS-309-25 OTC?
It is flammable. Keep it away from open flame, use adequate ventilation, block HVAC ducts, and handle empty containers as flammable liquids. Treated surfaces may become slippery; SURE-STEP additive can raise slip resistance.
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