Yeah, an update would be nice!
Apologies for the long silence. I didn't see this notification, until today, for some reason,even though im subscribed. Anyway, better late than never.
I cant provide endurance data unfortunately because I changed jobs and had to move, but...
I really liked the epoxy on 3/4" T+G subfloor plywood for my garage, so much so, that I repeated the installation when I moved to a new home in 2013. Main difference in new house was I did sleepers on wider 24" centers, so the floor would be more compliant(I have back issues). The exception was in the tire tracks, where I added a extra sleeper for 12" support under truck tires for pulling vehicles in occasionally(my garage is primarily a woodshop). If I have to move again, I will probably change the spacing up again, because 3/4" on 24" is too bouncy when rolling several hundred pounds machines across it. Possibly 1 1/4" subfloor over 24" sleepers. Or 2x6 sleepers to reduce the free span.
I was more cautious about application temperature when doing this floor, bringing epoxy cans inside the house AC the night before, and starting very early in the day to extend the working time of the epoxy. And so it went down much smoother, and with less stress. I used the silica additive and flakes for traction, again.
I also used many fewer screws , with smaller trim heads, because on 2010 floor, the casters on.my bandsaw/jointer/ tablesaw would drop into the 1/4" holes left by overdriving #8 deck screws with an impact driver, and then 800lbs of cast iron would crush the pine edges of the hole, making a formed cradle for that wheel. The toll would then be semi-stuck just on one caster wheel, which the toll woukd just swivel around on. Very annoying.... So learning from that experience, i also made a conscious effort to not overdrive the screws deep below the surface, so the epoxy could fill the heads in to keep the floor smooth. And rollable.
That 2013 floor's got 3+ years of light hobby use with no complaints. (Admittedly, The area near my welder pedal has a few burns in it from some drips of molten metal , but less damage than you'd expect for that kind of abuse)

Difference in screws sizes. There are three screws in this pic. Can you spot the torx head filled with sawdust in the epoxy?
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