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Thanks Jim I checked out those links to machine grinding and there are a lot of other very detailed videos on hand work from a fairly professional mirror maker so that was good.
I have seen the Angel products silver solutions on other sites and some NZ CN people have coated some big mirrors in similar ways. A worker at one observatory I read on CN spent years doing temporary silver coating for testing of their mirrors using a standard proprietory solution procedure and double head spray gun, like automotive finishers. . Expensive solutions if you do not like the result. But enough is supplied to redo many times.
Some of the big mirrors are protective silver coated I see on various sites with layers of nickel and other metals under various gas mixtures which seems even more complex than the aluminium vacuum sputtering vessels. All seems a bit complex and shame if we cant get mirrors coated here. Big mirrors would be worth the cost.
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