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I bought some cheap rubberized undercoating in a spray can (Mar-Hyde) at Wal-Mart for $3. Used 3 cans to coat the inside of my trunk on my 1967 Mustang Coupe. HUGE decrease in road noise! I plan to coat the floor panels, inside of doors, inside of all sheet metal with this stuff. Works great and is cheap. Anyone use this or anything like it?
 

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I just done the trunk and floorpans in my 92 Coupe. Also I had a piece of carpet with insulation made to replace the mat in my trunk. I'm still trying to put it back together to see if it helps.
 

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I did not find much mess...so far

I did not find the spray can to be too messy. You do need to let the material dry for a good 6 hours before it is fully set. If you touch it before it dries...it is messy. I sprayed the inside of my doors tonight and beneath the dash up where the cowl attachment is. I plan to do the underside of the car's sheetmetal next...
 

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I am not sure the Mar-Hyde is corrosion resistant

I used some on my bed in my Ranchero - the stuff seems to have pinholes in it and moisture gets inside and can promote rust.
 
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