By utilising the process of Acid Etching, Hydrochloric Acid can be used to clean the surface of concrete to allow for coatings to be applied effectively. Acid etching can remove the weak, milky layer of cement dust, lime and fine sand that can rise to the surface with concrete that is over-wet, had poor curing or been over-troweled. It involves allowing the reaction of a diluted solution of hydrochloric acid to the concrete surface, then rinsing off with water.
The acid chemically reacts with the surface, and dissolves it, allowing it and other water-soluble contaminants to be washed away. Removing the top layer will allow coatings to firmly adhere to sound concrete giving a much longer life span.
Find out more at Bondall’s Acid Solutions Website: Acid Etching Concrete