I have not used a kerosene heater with MAS, but I have with other epoxies. I did not have any problem. The heater will introduce some humidity into the air, but in the dry winter air, it probably won't be too much. At this point your epoxy is almost cured and a little heat to finish it off won't hurt anything.

You can get a little fast cure hardener. Adding up to 25% should not cause blush problems but will improve cure time. MAS Cool cure uses a 50:50 fast:slow hardener mix and it starts to have a little bit of blush. Blush is not the end of the world and if it means your epoxy cures in a reasonable amount of time, it is probably worth it.

> I searched the archives and found conflicting info on the use of a
> kerosene heater in a shop while epoxying. Garage is at 56 now and the cure
> rate is way too slow for me...56 hours and not sticky but still not hard
> enough to pass the fingernail test! I have a good kerosene heater and
> would like to heat the garage but have heard that the water vapor and
> other kerosene combustion by products may effect the finish of the epoxy
> as it cures. I would like to stick with the hardner I am using now
> (regular not cool cure).

> Has anyone used a kerosene heater while epoxying with MAS epoxy and had
> good luck? I also have a barbeque grill (propane) that would heat the
> garage but am unsure about the combustion by products from that as well.

> In either case, I will probably need to get fresh air into the garage to
> ensure I do not have any physical side effects (low oxygen).