Dynamat is very good stuff and designed specifically to stop resonance. Waterproof, temperature proof and sticks like sh!t to a blanket. Used it a lot on wobbly aluminium panels on Land Rovers and even on the casing of my central heating boiler! Available here http://www.incarexpress.co.uk/view_p...artno=DYN10425 or any decent car audio shop.

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