Liqui-hard Ultra lithium concrete densifier and chemical hardener is a ready-to-use, colorless liquid that hardens and dustproofs concrete at a molecular level. Simply spray on the product and then brush it into the surface with a microfiber mop. Liqui-hard Ultra solidifies the concrete, eliminates dusting and pitting, and improves durability. W.R. Meadows. 800-342-5976.