Chris wrote:
Are you sure about that? 16-21C? All epoxy would harden in the can.

He is right though - when mixed, it certainly canharden in the can -
the trick is to have as big a surface when you have mixed it as
possible, thushave as long an opening time as possible.

The 16-21 degrees is for a "full strength" cure.

Dane:

Epoxy doesen't set off at room temperature without harder.
Hardener is not acting as a solvent.
Heat is never a catalyst.
The hardening of resin is always a chemical reaction.

And yes, when mixed with hardener, all resins will cure.