That stuff is silly pricey. You could etch, patch and epoxy the whole garage for $200. You should be at least a grand ahead at that point and it looks very nice also. Don't buy the do it yourself hardware style stuff. Purchase the 2 part commercial stuff from Sherwin Williams or another major paint store. I've had to do a bunch of it over the years. My well used car shop made it 5 years before I put another coat on it. I'm not sure dragging transmissions and heavy welding would be nice to the other products. I'd also like to see the snap on stuff hold up to my forklift.
I understand that not everyone is going to abuse the floor, but I like stuff tough.