Here is the way I go by acid staining concrete.
1. Make sure that the concrete is open. Meaning no sealers, oils, stians etc. Using a mild detergent. DO NOT USE ANYTHING THAT HAS ACID.
2. Clean the floor COMPLETLY and make sure there is no resisue left behind.
3. Let dry.
4. You can change colors with the amount of water you use so make sure you know what color they are looking for. Add the water and stain into a garden sprayer. ( Cheapest 1 gallon from lowes or home depot).
5. With using the fan tip pass in circle or figure 8 motions making sure the sprayer is pumped up completly. Do not leave puddles because they will be there forever. You can scrub it in to make a more uniformed look. Depending on the color is how long you leave it on.
6. You will need to neutrilize the acid before you put the sealer down. Take ammonia and water and clean the acid residue up. Make sure all residue is gone.
7. Let dry completly or the water will come through the sealer and turn it white.
8. I apply my sealers with xylene and sealer mixed into a garden sprayer. You can roll the sealer on too with a mohair roller. Do not use the same sprayer that the acid stain was in. You may still need to add grip to it just mix Sharkgrip into the sealer. DO NOT OVER APPLY THE SEALER.
That is all it takes if you need more information go to
www.concretenetwork.com. Good luck.