Acid etching solution will not work properly on greasy, oily, or painted surfaces. This concrete must first be cleaned with either, Northern Aqua-Blue, or Northern Scrub-Free, for heavy film buildup removal.

Acid solution should always start at the lowest level of a floor, usually the drains. Apply in a circular fashion out away from drains. Remember acid solution will not work properly when poured on "spent" or "used" acid solution. Acid solution should "foam" or "froth" instantly when poured on the concrete. Slow or no reaction is a sign the concrete was not ready to be etched. Clean and repeat above procedure.

Muratic or Hydrochloric acids are available commercially at most hardware or pool supply stores. Mix 2 parts water to 1 part acid for good etching. Using a plastic watering sprinkler, apply the mixed aid solution (always add water to the can first) at a spread rate of 50 sq. ft. per gallon. Acid solution must be worked into the substrate with a stiff bristle broom to completely agitate the floor. Once acid solution stops frothing (approximately 10-15 minutes) flush the remaining solution to drain and rinse floor thoroughly. "Do not let solution dry". Rinse floor a second time with some household ammonia to neutralize any acid residue that might remain.