There's Angel Gilding spray silvering that's not really spray painting. It uses spray bottles but is really a chemical deposition.
Have a look in the ATM section and see if anyone is silver coating their own mirrors.
The optical fibre sounds like a good idea, even without a coating. It will certainly be smooth and it's designed to be as reflective as possible within the fibre so it would seem reasonable that the outside would be too.
Steve.
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