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A few things to think about when considering the adhesives are:
1. What is the shelf life of the product? (most of the "epoxies" are only 6 months) If the shelf life has expired the two parts will not mix properly, giving you only a fraction of the advertised "hold."
2. What is the "hold life" (how long before the adhesives starts to chemically break down after it has been mixed and cured)
3. The adhesive's ability to tolerate moisture. (I found that the devcon "waterproof" is not really waterproof)
It's no secret that I prefer the standard Accra-Glass, mostly for the reasons listed above. If the testing lasts that long, I suspect you'll find it doesn't reach it's full hold strength until about 5-7 days after it's applied, but if the testing were to go on for a number of years, the 50/50 mix epoxies would start crumbling and falling apart at about the 4 year mark. Put them in direct sunlight, and that time would be reduced to about 1 year.
Maybe I just look at it differently, but for me it's not the inital "hold" that sells me on a given adhesive....it's whether or not it's going to be holding 5-10 years down the line.
I'm looking forward to seeing how the results of this test come out.
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