I just did the floor in my 28x32 detached before I moved in.
I spent 2 days grinding the previous owners Home Depot kit off.
I ordered a "job on a pallet" from Armorpoxy, it cost about $1300 if I remember correctly. The only thing I would suggest is to get some extra top coat(clear)
The kit included:
Fleck (decorative flake)
Top coat (clear)
Antislip (essentially sand goes in the topcoat)
Mixer (need your own drill)
The company was awesome to deal with, and super quick on delivery
I have a thread in the ManCaves column with some pics of the job.