I would not be using 5 minute epoxy that has been sitting for 5 minutes. You have to use it while it is in it's most liquid state. Once it even begins to thicken a large percent of it's ability to adhere is gone. I took a seminar put on by West on epoxy. They pretty much classified 5 minute for temporary bonds. One thing they really emphasized was the mixing.
When it says to mix for one minute that is how much you should mix it. I think a lot of guys give it a few swirls for like 10 seconds and think it is done. To get the complete chemical reaction you need to mix it like crazy and use it as quickly as possible.
The big problem with 5 minute epoxy for any kind of wood working is you can't do a wet-out, it sets up too quickly. You need a good wet-out for a good complete bridge between the materials. It needs to soak into each piece to have a good integrated bond. As far as building cues, what is the hurry? Use an epoxy that gives you a nice open work time for wetting out the work and gives you a bond you can trust.
Normally I would end by saying "Just my opinion", but actually it is the opinion of every technical support person or expert on epoxy I have ever spoken to.
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