Concrete Countertop Stain 4oz. per bottle. Will cover approximately 10 sq. ft. depending on porosity of concrete. Z Aqua-Stain UV is an extremely versatile and long lasting water based concrete stain. It is a safe, non-toxic product used to color various concrete surfaces. It is a great alternative to common acid stains. It contains no hazardous components, yet can produce the mottled, variegated look associated with chemical (acid) stains used in decorative concrete. It is UV stable and will not fade from exposure to direct sunlight. Aqua-Stain UV can be used alone, mixed, blended or layered for any number of natural looking effects. Stains are most commonly applied with a rag, brush, roller, sponge, or pump type sprayer for different effects. Aqua-Stain UV vs Aqua-Tint For outdoor applications, it is safer to use Aqua-Stain UV. On indoor applications with tight finishes such as a burnished or polished surface, Aqua-Tint may be the better choice. If the concrete is neither outdoors nor has a polished finish, either product will work well. A rough analogy is the stains are a form of paint, and dyes are more like an ink.