I used some of this stuff in my walls when I did some in wall speakers for my home theater, but it's for automotive use. It's made by Mr. Gasket, and I bought it from
Titan Motorsports. If you don't see it on the site call and ask, I know they had a lot when I bought a case:
Quote:
Product Description
Mr. Gasket G-Spray are designed to reduce ambience noise level. They are perfect for irregular shape and are corrosion inhibitor. These sprays are easy to use and are weatherproof.
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It worked out really good.