I would like some input on sound deadner, I have some left over Reflectex(tm) insulation, which is two layers of aluminium with a 5/16 double ply bubble wrap dead air space. I was thinking of useing this behind all of my panels. Has anybody used this. Also I was wondering if the tar (that I am scapping off)inside door and below the rear window is waterproofing or was it used as sound deadner. P.S. Would have posted in the interior section but nobody seams to stop by there. Thanks Stuart