is for use in ambient temperatures down to 35 degrees farenheit, according to the manufacturer. They go on to say it gives an overnight green stage cure at 40 degrees f. MAS hardeners are also phenol-free, modified amine which don't blush. I personally use West System products, so I can't vouch for these claims, but I'm sure someone here can. Oh, also: I'd do my first few coats at night, when the temps are falling, to prevent outgassing into your still-wet epoxy. Good luck.
Cheers,
F