Use some product that will stick to the roof during the hot summer. Read what Dynamat and it's brothers say on the packaging.

All you want to do is change the resonant frequency.

__________________
Regards

Warren

Currently 1965 220Sb, 2002 FORD Crown Vic Police Interceptor

Had 1965 220SEb, 1967 230S, 280SE 4.5, 300SE (W126), 420SEL

ENTER > = (HP RPN)

Not part of the in-crowd since 1952.