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Originally Posted by ootyboy  Russel, are you saying that you can actually create a concrete sub-surface that does not crack? I can tell you that I am not a concrete expert, but I've spoken to many concrete professionals, and the one certainty with concrete is that it WILL crack. It might not be today, or tomorrow or even five years from now, but it is guaranteed to crack, regardless of the amount of rebar that you use.
This is especially true in Northern California, where the ground moves quite a bit, and at least where I live, the soil is hard clay which hardens in the summer and expands in the winter with rains, causing cracks in walkways, walls etc.
Now we all agree, that Epoxy for all its merits, does not flex. If the structure moves as a result of settlement (which cannot be avoided), or ground movement, it will fail. No amount of concrete work will solve that problem.
However, the main point of this thread is not to talk about Epoxy or Pond Armor, but rather to share a narrative of my project with the group. As such I will continue....
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Think about it, yours cracked in three months. That is an indication of substandard work. I am a general contractor and work in concrete all the time. If the ground is properly prepared and compacted. You should not have had any movement in three months. If the pond were constructed properly and the ground moved, the pond should have been able to withstand that small movement without cracking.
I work with many engineers that design rebar shedules for different applications. One of them designed a pool on a hillside. The hillside gaveway and the pool tumble down the hill. When the pool was insepcted it was still one uniform, intact shell. No cracks.
I only brought this up because the product did not fail, your substrate did.