Curing and Sealing
Applicator Guide for Water-Based Curing and Sealing Compounds
Water-based concrete curing and sealing compounds are different than solvent-based materials of the past. Water-based products require special planning and understanding.
- Water-borne curing compounds need to be applied quickly, after the bleed water has disappeared, but while the concrete is still damp. If the concrete surface has dried, it should be wetted with water before applying a concrete curing and sealing compound.
- Water-borne, clear curing compounds appear white when first applied. However, once applied, and as time passes, they will turn dry clear. The exception is resin-based, water-borne curing compounds, which will dry to an amber resin colour.
- For easy and adequate application, use clean pump-up spray equipment with fan-tip nozzle. Never let the pressure drop below optimum. Clean the sprayer immediately after using the equipment. Do not mix solvent-based products with water-borne products. Even the slightest contamination from previously used solvent-based materials can cause water-based curing/sealing compounds to become permanently damaged, stringy and likely to clog sprayer nozzles.
- Water-borne curing and sealing compounds should be sprayed and applied in a very thin and uniform manner. Do not puddle. Too much product will result in a mottled look. If during the application the material comes out as a stream or droplets, as compared to a mist, stop application, clean the nozzle and start again. A spotted or mottled surface appearance will occur if this precaution is not followed.
- The installation of water-borne products, both curing and sealing compounds, can result in a slight darkening of the concrete surface through its proper and effective retention of internal gauging moisture. Inform the owner of the project that the darkening will occur. A small test application is recommended to insure the aesthetics of the resulting finish are acceptable to the owner.
- Important: The time needed for resin-based cures to oxidize and dissipate will vary depending on the applicator rate, the amount of direct sunlight and traffic upon the surface. A sun-protected or traffic-protected membrane may remain in place for many months.
- Low temperatures and rising humidity will cause water-borne products to have greatly extended drying times. Expect this condition in enclosed environments with little or no cross-ventilation.
- Protect water-borne curing and sealing compounds from freezing while in the containers. Freezing will render the product unusable and unrecoverable.