Mario,
Well, it does not have a 'hardener', it just out-gasses. When frozen it looks like a lump of slimey silly putty because the polymers take a set, and that's all she wrote. I have some of my experimental batch maybe 6+ years old, still going strong.
In O the main complaint is that you can shred the SNOT when really pushed. But Garden folks have had good results too. See here.
Bill
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