New member here. Been lurking, finally joined.
Can't speak to your specific product mentioned, but I have used the standard hardware store 2 part epoxy to repair atlas handrails with wonderful results. I don't know the brand name of the product, I inherited several tubes from my dad about 5 years ago, so the name is a bit worn off now, but the stuff has been around forever.
When joining the two broken handrail sections, it leaves a bit of a blob if you put it on too thick. This happened on my first repair, but I waited for it to cure about three hours and was actually able to file down the blob to make it smooth without breaking the repair.
I think super glue type products tend to get brittle over time and lose their adhesion.
Others may have different experiences, however.