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I plan on insulating the cab firewall to backwall i need to use some kind of spray first however to cover some bare metal where surface rust was sanded. I planned on using cascade vb-1x under some dynamat knockoff. I planned on spraying 5 gallons worth

then i thought of linexing the interior like alot of people and then adding the dynamat knockoff

which do you think would be better for sound insulation

heres the cascade http://www.cascadeaudio.com/prod/vb1x.html
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