i asked a friend about porthole glass, he wrote back in an email...
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"most boats these days dont have a round porthole. and there especially not made out of glass anymore..."
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so if someone was to use porthole glass it would have to come from an old boat, at least 1970's i'd think. coating laminated glass? does the coating process require heat, because that would proberly melt the layers between the glass.
jarrod