Thanks John, always very grateful for the voice of experience!
OK, I get the point about epoxy sales. BTW, my epoxy jugs are stored in the utility room adjacent to the garage at about 75 degrees. Also, although MAS says 55 is OK I have always done my laminating work at 59 or higher--so I'll increase the minimum by 1 degree.
I am glad to hear 60 degrees is OK, though, because it gives me more time to work, especially on larger areas. And like I said I can only work with epoxy from late fall to about mid-spring because otherwise it gets too hot here and I've had bad experiences with the epoxy kicking before I had a chance to smooth it out. And this was at a time when it wasn't all that hot (by Oklahoma standards), about 87 or 88 degrees.
I guess this is where the "epoxy sales" argument is valid at the other end of the scale--MAS claims a pot life of a little over 17 minutes at 86 degrees and 11 1/2 minutes at 95 degrees, so I should have had at least 15 or 16 minutes of pot life. Not so! I had about 3 minutes at most, and no, I didn't mix up a huge pot, I had mixed about 6 ounces of epoxy and added wood flour to that (lost perhaps 3 minutes of pot life while mixing--also the epoxy was cooler, about 75 deg.). The lesson I should have learned is that if you cannot trust them on the high end, why should you trust them on the low end? (I have printed out their chart and posted it in my garage, but I'm going to modify, then re-print it.) Other than this, I love MAS products--much easier to work with than other brands in my limited experience.
So the bottom line as I see it seems to be a relatively small temperature window to work with (about 60 maybe 80 deg. F) unless you have the luxury of a heated and air-conditioned shop.