Originally Posted by FF
If using laminated glass it might pay to seal the cut edge with varnish or epoxy .
Only an issue if the edge of the glass will be exposed to moisture. In my installation, all edges are bedded in Sika 291.
I do note that some of my portholes, in bronze fixtures, where the glass was factory installed, the laminate plastic is cloudy around the perimeter. This is likely an indication that moisture has arrived in those locations.