All I want to say is if you paint/coat your garage floor, you'll be doing it for the rest of your life. High traffic areas will wear thru, it will be chipped, scratched, gouged, possibly lifted due to vapor migration which will become areas that need re-coating. I readily agree when first done it will look great, a nice piece of eye candy; I don't think you built your shop to just look at it, I suspect you wish to do some serious work on your car. Do you wish to work on your car, or do you want to paint/coat the floor?
