Stephen mostly works with the big boys in volume production marine, wind blades, and aerospace. As a result, room temperature cure epoxy is barely on his radar. That is very different from my DIY guys and the custom builds who both use the above epoxy. He speaks highly of Derakane 411 which is a vinylester that he calls more epoxy than vinylester. The big boys have less concern about impact resistance than cruisers and charter guys do. My one concern with the high temperature epoxy is the brittleness. I will keep studying with Stephen’s information in mind.