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I've very recently done my doors and behind my front speakers in 'silent coat' sound proofing. I bought 2 starter packs from car audio direct website which was enough to do both front doors with some left over. To be honest i've not really noticed much of a difference but i only did it as the original stuff was crap!
If your planning on using flashing, then i've read many times that you will need two or 3 layers to get any real difference.
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