OK, what's the deal with epoxy and cold? I mean my 90min exopy still isn't hard after 25 hours and my 5 minute exopy is still soft after 2 hours! It's not freezing here but it's cold enough in the house to see my breath. I'm concerned whether the exopy is ever going to harden - and am I going to have to wait until summer.

Could one of you from the colder climes clue me in?

PS. Most Japanese homes do not have central air -- instead we use electric carpets!

Unfortunately epoxy materials are set as a result of chemical reaction rather than evaporation. Heat is a necessary component for a reasonable set up time. Sometimes a heat gun applied every few minutes will get the job done.
Back in the 70s I used to put catylyzed K&B and Hobbypoxy in the refrigrator and keep it for up to two weeks before it set to the point that it would not spray.
No real magic in hobby grade epoxies, it just requires 70 F or above to get reasonable curing times.

Thanks. I set up shop right in front of a space heater and my epoxy is epoxy again! Plus it has the added advantage of keeping me from freezing to death in my own home.