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You could use a spray on sound damping, truck bedliner coating or undercoating on the inside. The trick to killing sound is to keep or stop the sheet metal from vibrating. A thick rubber type paint "should" do it. I don't know what the wieght change would be. My car gained some wieght when I put sound damping mat every place I could think to put it. But it is quiet inside now.
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NO_H2O
72 1302 Smack Black GL
73 Bus (2L CIS Powered)
66 Beetle, 73 Standard Beetle
72 Pinzgauer 710M
Volksport Kafer Gruppe
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