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It was prescient to title the thread 'The Cost of Learning'.
I looked back but it's hard to tell from your pictures whether there were any pieces bolted together before painting (framing, etc.). If there were, they should have been painted before assembly so the poly (polyurethane?) didn't need to bridge the gap. Location of the damage may reveal something.
What do you think about Plastidip? You could use up the poly on the worst spots, then 4 or 5 spray coats or 1 or 2 rolled coats of Plastidip would make a rubberized coating that would seal everything together. It needs to cure 30-60 day, then it will be more or less immune to nicks and tears.
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