I have never use MAS epoxies. So I can’t comment on their suitably for cold weather work. However I have used System 3’s cold weather (fast) hardener, down to temperatures in the mid-forties. (About as cold as it gets here is Southern California.) Anyway it worked fine, I never saw a significant difference in clarity between it and the medium speed hardener.

Don

: I plan to build through the winter months. Do I need to wait until warmer
: weather for the glassing of the boat, or will the use of the MAS
: preparations allow me to glass in the winter months? I will likely use an
: electric heater when actually building. Do I need to worry about the
: effect of temperature changes on the boat structure itself after leaving
: the garage? I would appreciate all cold weather warnings. Many
: thanks....Bob