I used Dynamat, foam, and mass loaded vinyl on the floors and other areas on my 70 Formula. However, I did not put Dynamat or anything else on the roof because I was afraid it would not hold up here in the AZ desert, and didn't want to risk having to redo the headliner. Even if it didn't fall, I was afraid the adhesive/butyl might seep past the tape or stain the headliner if someone pushed up on it.
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"If the best Mustang is the Camaro, the best Camaro is actually the Firebird" David Zenlea
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