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I posed two of the questions mention above to Wayne at Saintech:
Q. Enhanced coatings reduce contrast and increase light scatter.
A. Wayne implied that the higher scattering of silver mirrors was due to older methods of metal deposition rather than the overcoats. Saintech use Ion Assisted Deposition (IAD) that can results in coatings "with very fine crystallites with very low scatter".
Q. Silver is a difficult substance to remove and re-coat when it needs to be done later down the track, possibly ruining the figure on the mirror.
A. Removal of old silver-based films is easily accomplished with nitric acid. Providing the mirror is not left for long times in the acid, there is no damage to the mirror surface or figure.
Wayne said he is hoping to produce an information sheet on his coatings.
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