I have done two tests of the epoxy butt joints, both times being very careful to mix in the proper proportions,etc. In both instances, I was able to peel the fiberglass tape off the two pieces being joined with a very moderate amount of effort.
Chuck L. and Gary on dwforum both think that the epoxy hasn’t fully cured yet, likely due to our low temperatures. I guess I am being too impatient although I have left them for 19 -20 hours before pulling everything apart. Gary pointed out that it can look cured but not be fully cured. He said that if the tape is at all flexible when it comes off the epoxy wasn’t cured.
I’ll do another test this weekend. We are expecting higher temperatures so hopefully that will make a difference…that and me exhibiting more patience before testing the adhesion of the tape to the epoxy.