Back when I was using Stonhard, there were no subs, My sales guy had the same crew all the time and they covered a given territory. The product was top notch and I believe a part of the "expense" of these floors was the impeccable customer service and their ability to schedule work to meet our manufacturing schedules. We had a massive plant with over 200K sq. ft of epoxy in 3 buildings. Surface profiling, moisture mitigation, conductive epoxy tied to building metal (electronics manufacturing). I think it was like a 6 or 7 coat process.
My salesman gave me Stonhard product (primer and topcoat) for my home garage. I have posted about this floor before, but briefly.. the floor was unfinished concrete that had already seen 24 years of auto repairs, leaks, paint, grease, welding and nearly any possible type of garage activity. I gave it an acid etch, I think I tried to get the worst of the stains off it and then I mixed and applied the primer and then the topcoat the following day. I have beat the living **** out of this floor for nearly 11 years now. No delamination or peeling or failure. I have stained it with brake fluid, dropped big heavy stuff on it and run floor jacks all over it and in my estimation this floor has taken everything I can throw at it. Don't get me wrong, it's nowhere near as shiny as when it went down but it scrubs up good, is still totally intact and is a breeze to clean. When I read of all the epoxy related trouble guys have posted here, I am super happy to have this floor and appreciate its' performance given the minimal prep I did before applying it. But the prep I did was the only prep that my guy recommended and he was spot on!