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Sorry I still dont get it, maybe I am a bit simple but if you have two materials that are basicaly equal in their attributes but one has a much higher impact resitance, why wouldnt you go for that ? I would rather suffer with scuffing in my case and have the extra "water tightness" In most sailing boats portlights are for light more so than picture windows. What have I missed ? Is it to do with the "charter industry" ?
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