JohnB,
The key words you used here are "most epoxy". Flex Coat is humidity sensitive, if you want to do one of your tests, wrap up a rod in august and epoxy one guide in an air conditioned room and roll it till it sets up, then do another with your windows open on a humid day and roll it till it sets. I'm just trying to help out here, I guess there's always a guy looking to tell everyone else their ideas are wrong, are you him? I have built and repaired over 250 rods and I only use Flex Coat, I've been through the trials and tribulations of "THIS" epoxy