Most calls start with a garage floor that's dusty, spotted with oil or flaking where an old paint or sealer gave up. Before anything goes down, we grind the surface and look the slab over, because a coating can only hold as well as the concrete under it. That part never shows in a photo of the finished floor, and it's the part I spend the most time on.
The price moves with the size of the floor, the cracks and old coatings we have to deal with, what the moisture check shows and which system you choose. The schedule turns on the same things, plus how soon the space can be cleared out. Once I've seen your slab, your written estimate gives you the figure for your floor and the prep it covers.