While I did not use dynamat, It took about 110 sq feet of Second Skin's Damplifier Pro to line the inside of my 68. I covered the doors outerskin and behind door panels, outer skins of the quarterpanels and behind the reas seat panels, firewall and floorboard. I haven't lined the roof or behind the sail panels yet, but I figure it will take about 40 more sq feet.
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