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Author Message   Lars_o Tinkerer Username: Lars_o Post Number: 4 Registered: 02-2009 Rating: N/A Votes: 0 Posted on Friday, February 06, 2009 - 03:47 am:    Yes, I'm pretty sure that the coating will be fine. The facility where they do it is normally used for coating telescope mirrors at the Hamburg observatory: http://www.hs.uni-hamburg.de/EN/Oef/Stw/Alu-anlage/index.html