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Discussion Starter · #1 ·
For the last two installs I used regular modelling clay to pack a couple of hollow speaker spacers. Today at Home Depot I found a brick of clay-like material, found in the electrical parts aisle, for sealing around the point where wires enter buildings, etc. It's very dense, heavy stuff, won't dry out and was only $2 for a good-sized chunk.
 

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Probably duct seal compound. Been using it for awhile. It's da bomb, yo....

http://www.diymobileaudio.com/forum/697918-post16.html

Neoprene caulking used to ensure adhesion on vertical surfaces or where vibration is seismic.

IME, clay is better where you just need mass or a material that won't return to form. Duct seal goo is a better damper as it's a lot more viscoelastic and has different adhesive properties (ie it's sticky and stretchy like the butyl rubber used in CLD mat products.)
 
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