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I know Saintech do, or does, a Silicon Dioxide overcoat. I had a discussion with Wayne about coatings a couple of years ago when I got my Galaxy 18 inch mirror recoated. I went to Bunnings with Wayne to buy some pool acid to strip my old coatings and spent the day watching the whole process. He spent 8 hours stripping the old coatings and cleaning the mirror and 10 minutes putting the new coatings on! I suspect Wayne Sainty knows more about coating mirrors than anybody else in Australia. Not sure if he is still in business though.
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