The coatings on all newts do need replacing in time , my old gso 12" mirror is in the cupboard available to anyone who wants it cheap but it needs recoating
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Maybe you could mask off the edges and keep using it for a few more years
Its hard to tell how your mirror is fairing from that pic .. nothing good ever comes from photographing or staring at our mirrors , its always going to end in tears sooner or later, how much light is passing through it ? ,, look from the back .
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