This is a brand new concrete slab, in an old building, poured with the intention of acid-staining.  We had to wait several months while the slab cured and dried to an acceptable moisture content.
     During this period, renovations and other buildout modifications took place in this commercial project space.  Acid-stained concrete flooring is generally the last work to be done in a building or residence.
     Above left, you can see the first coat of blue acid stain being applied.  Above right, the second coat.  High quality acid-stained concrete flooring almost always requires two coats of stain to achieve the full color.
     The above two photos show the unsealed, blue base color after rinsing the excess stain residue.  We weren't finished staining, though, as our customer wanted accented color highlights.
     We then applied three additional colors of stain - gold, brown, and reddish brown - to approximately 2/3 of the floor, over the blue base.
     The true coloring of the floor can't be seen until the clear sealer is applied.  Different types of sealers enhance acid-stain coloring to differing degrees.  We used several different sealers on our pre-project color samples.
     On this project, the customer chose a high-solids polyurea sealer.  The benefits of this sealer are deep color enhancement, no odor during application, and extremely high durability.