Acid residue left behind must be removed before applying the sealer. Use a different pump sprayer than you did for the stain. Create a neutralizer by adding four parts water to one part ammonia and spray the floor. Allow it to dry.
For floors that have been troweled and smoothed out by hand, dilute the acid stain with a 1:4 ratio of 1 part acid stain to 4 parts water.  For floors that have been troweled by a machine, (which are mostly industrial or commercial flooring), the acid stain mixture will be more concentrated, with a 1:1 ratio of one part acid stain to one
Staining a Concrete Basement Floor - (The wrong way) I literally got on my hands and knees and scrubbed every square inch of the floor. Then I sucked it up with a wet-vac. Then poured fresh water on the floor and washed it again. Then sucked it up with the wet-vac and so on. (the wet-vac was a real time saver!) Finally, I bought the stain,
Log Home Build Episode #9 - Acid staining the Basement Floor - Duration: 12:53. Country View Acres 57,462 views
Acid Stain is to concrete much as wood stain is to wood. Reacting with the minerals already present in the concrete and that were randomly dispersed when it was poured and finished, highs, lows, dark and lights, mottling and marbling is a natural effect of the process.
Concrete Stain Home Get the Look - Stained Floor Pictures Color Chart: Concrete stain colors Comparison Chart: Compare acid stains, water-based stains and dyes Stain Buying Tips: Questions to ask before you buy How to Stain Concrete Concrete Stain Cost Types of Stains and Coloring Options