Hi Ann,
I used the MAS "Winter Cure" epoxy at about those same temperatures. It worked well, but it does blush. You will have to wash the kayak down good with soap and water between coats.

: I'm getting ready to glass my Night Heron in an uninsulated woodshop in VT,
: heated by a woodstove. I glassed a stitch and glue a couple of winters ago
: in another woodshop that was kept at 50 degrees. I used System 3 with the
: fast hardener, and didn't heat the boat up, so put the room temp. epoxy on
: a cold boat, and ended up doing a lot more sanding than necessary. This
: time around, I'll probably put a couple of electric cube heaters under the
: boat, and get the ambient temperature up with the woodstove-hopefully to
: around 60 degrees. The temperature will probably be a bit uneven-warmer
: near the stove, etc. Any suggestions for an epoxy/hardener combination
: that might fit the bill?

: Thanks,
: Ann