Auralex StopGap Acoustical Sealant Auralex StopGap Acoustical Sealant Description: Auralex StopGap Acoustical Sealant is a highly elastic, water-based sealant that reduces sound transmission at the perimeter of wall systems or around electrical box cutouts, to achieve specified STC/MTC values. StopGap's surface dries to a tough film but the sealant remains flexible and stays pliable for up to 5 times longer than alternative brands. And unlike other products, StopGap has no residual run-off. St
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