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"Only an issue if the edge of the glass will be exposed to moisture. In my installation, all edges are bedded in Sika 291."
All these goops may be water proof , but not moisture proof , it can take years but moisture (usually enough to creep into the window edge) gets in....eventually.
Even varnish only slows the moisture from the window edges , in my GM 4106 (1964) bus conversion about 2 inches around the side windows is foggy.
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