- For acid etching concrete surfaces, the hydrochloric acid must be diluted with water. The ratio will vary depending on the surface texture and condition. The general ratio is 20 parts water to 1 part acid but for smooth concrete (such as garage or warehouse floors) a higher acid content is required -maximum strength - 10 parts water to 1 part acid. NOTE: Always add acid to the water (never add water to acid) to avoid potential exotherm (heat) generation which can result in boiling and subsequent splashing of the acid.

-Apply diluted acid to surface using a large head plastic watering can, applying in a crisscross motion (approximately 5-10m² sections). Acid will start to fizz on the surface once it starts to react with the laitence in the concrete. Pressure clean immediately to clean and remove all remnants of acid (do not allow acid to dry on surface). Pressure clean at minimum 2000 psi. Allow surface to dry completely before applying any coating.