Based on a 22x22 garage, they apparently do it in one day. But to spend $3500 on a job that takes them that quick is shocking, unless material cost is substantial.
After looking into epoxy's, I think I'd be going with something from Legacy Industrial.
Today I called a local garage outfitter regarding flooring and they do polyasparatic, but at $6.50/sq ft :eyecrazy:I could tile for cheaper (i'm a tile setter)