Epoxy: Finish Coat Required?
 

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

Epoxy: Finish Coat Required?
 

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

Epoxy cannot harden if it's not mixed. The resin may crystalize over
time, but it can be "rejuvenated" by heating it until it turns back to a
clear liquid.

Polyester resin WILL eventually cure without being mixed with hardener,
which is actually a catalyst, not a structural/chemical component of the
final product.

Epoxy: Finish Coat Required?
 

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.

Epoxy: Finish Coat Required?
 

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.