This might be off base, but maybe your epoxy hardened and just has a greasy film?

: Well: I'm getting ready to glass my newly stripped kayak, and while I'm
: finishing fairing and sanding I thought I would try out a couple of test
: panels of epoxied strips to see the color, etc...well, to my dismay, the
: epoxy never hardened.

: I'm fairly certain I mixed the hardener at the right ratio (I have metered
: pumps, and I did it twice). It hasn't been exactly hot here in Buffalo,
: but the temperature in the daytime has been in the low 60's. It's been 24
: hours, and the epoxy is still wet to the touch! What is going on? Is there
: an 'absolute temperature' that must be reached for the reaction to occur?
: Will it just take longer at lower temps, or will it never happen? Should I
: try a mixture of fast and normal hardener to deal with the low temps?

: Thanks in advance.

: -Charlie