We grind. We don't etch.
Acid etching is the cheap way to open a slab: wash it on, let it burn the surface, rinse it off — in a garage with no floor drain. It bites unevenly, it leaves residue behind, and it does nothing about the weak, dusty top layer of the concrete. A diamond grinder takes that layer off mechanically and opens the same consistent profile across the whole floor, corner to corner and right up to the wall. Coating needs to key into concrete. It can't key into dust.