Liqui-Hard Ultra concrete densifier and chemical hardener is a ready-to-use colorless liquid that hardens and dustproofs concrete at a molecular level. After the product is applied and penetrates into the surface, a chemical reaction produces a byproduct that fills in the pores of the concrete one molecule at a time. The finished surface is an improvement in abrasion, durability, and chemical resistance compared to untreated concrete. W.R. Meadows. 800-342-5976.