Sealants are used to prevent sound leakage around the wall or ceiling assembly that you have built to block sound. Remember, penetrations and leakage in your wall or ceiling or around doors (that add up to 1% of your walls and ceilings) will lose 50% of the effectiveness of what you have done.
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Green Glue Noiseproofing Sealant (12 Pack)Sold By: The Case
OSI® SC-175 Acoustical CaulkSold By: The Tube