Sealing and Protecting Exposed-Aggregate Finishes

Applying a transparent concrete sealer to an exposed-aggregate surface can improve both its performance and appearance. These sealers—typically film-forming acrylic resins—can help protect against spalling, dusting, efflorescence, freeze-thaw damage, stains, deicing salts, and abrasion. A sealer will also enhance the color of the aggregate, accentuating its depth and richness.

When selecting an exposed-aggregate sealer, look for a product that:

• Is non-yellowing and UV resistant.
• Will provide a high-gloss “wet look” that deepens and enriches the color of the aggregate
• Repels oil, grease, water, and stains.
• Is recoatable.

Sealers formulated specifically for use on exposed-aggregate concrete are recommended. These products should be applied to clean surfaces that are free of contaminants. A brush, short-nap roller, or airless sprayer can be used.