There is quite some differences between epoxies, thickness being one, ratio of hardner to resin being another, but the main one that makes a difference for kayak work is clarity and colour. Some are green, some yellow, some milky etc. So it does make a difference for work where you want to show off the wood to advantage.
JohnK

: Im sure everyone has an opinion on this one. Does the brand of epoxy really
: matter? I once talked to a guy that sold 55 gal drums of epoxy. He said
: that most epoxy, no matter the brand, is the same. He said that there are
: not that many epoxy makers and that all the different brands get their
: epoxy from the some supplier. ???