Because a power troweled floor that's really tightly troweled ... As soon as that acid stain hits the concrete, it's chemically reacting. So, if I roll across a slab, and then I come back and ...

acid stains are more durable, easier to work with, and cheaper, but this type of concrete stain isn't without its limitations ...

Concrete sealers can prevent stains in the future. You can apply most sealers using a paint roller or sprayer. You can also acid stain the concrete surface before sealing for a marbled look.