Bill, I've used marine grade GE silicone sealant for mirror glass twice now and with no problems for over 2 years. After talking to mechanics, we decided the best pattern to prevent air bubbles and moisture being trapped was an upside down W inside an upside down U. Not too thin a bead, not too thick (definitely not too thick if it's a heated mirror as in the 900s). I put a small block of 2x4 against the glass and wrapped it tight as I could with multiple bungees for an overnight cure.
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Dave -still with 940's, prev 740/240/140/120 You'd think I'd have learned by now
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