Quote:
Originally Posted by andy
Considering how it ages, I'm not sure why anyone would want to add new PVA. I just use some foam mounting tape in the corners as spacers (usually 2 layers thick), then seal the edge with silicone. After it's dry, I go around the edge with packing tape for a little extra strength. The safety glass will still do its job without the PVA, there will just be slightly more glare with an air gap.
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One could always use something like RTV615 which will not age and does a nearly perfect match of the index of refraction of the glass. This will eliminate the reflections that you get without the PVA and prevent any fogging over time. It will also give you some added protection. But, it's very expensive which is probably why they went with PVA even though they must have known that there would be an eventual problem with microbial action and evaporation.