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Interesting question. I got my new 12.5" conical mirror exactly because of the prohibitive cost of re-coating. Not many coating facilities are available in NZ, and those that do exist seem to not offer protective overcoating. Without overcoating I doubt a mirror would last very long especially here in our relatively humid climate!
I would have had to pack it up, ship it overseas, wait several weeks probably, and pay for the shipping both ways as well as for the coating itself. Given that my previous mirror was a run-of-the-mill 10" which I could likely replace with an equally well performing GSO for a few hundred dollars I just didn't think it was worth the trouble.
So I decided to upgrade and got a 12.5" conical Royce mirror. I did consider the issue with the epoxy, but I'd agree that once this mirror needs a re-coat I'll likely have moved on to a different/bigger setup anyway.
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