If Liqui-Hard Ultra is applied immediately after final finish, would it serve as a curing aid? Yes, Liqui-Hard Ultra can be used on fresh concrete and will serve as a curing aid. Was this article helpful? Yes No Related Articles Would any of our densifiers be suitable for a carwash application that would be submerged in water? This photo shows a floor after Liqui-Hard Ultra was applied. It appears there is a brown dusting that is able to be swept up with a broom. Why is this happening?