When you apply a water and acid solution to a concrete floor with the desire to roughen up the surfaces, this is called concrete etching. The pores in the concrete are opened by the acid wash which allows for strong adhesion of any new coating applied to the surface. Concrete etching is a cost-effective method to prepare your concrete flooring. It neutralizes the concrete's alkalinity while also roughens up the texture, this further increases the coating and concrete's bond.