StopGap™ Sealant

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(1) Tube of StopGap Sealant with nozzle detached
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Auralex Acoustics, Inc. (“Auralex”) warrants to the original purchaser (“you”) t…


Auralex Acoustics, Inc. (“Auralex”) warrants to the original purchaser (“you”) that Auralex’s products will perform to published specifications and will be free from defects in materials and workmanship under normal application, installation, use and service conditions for a period of ninety (90) days* from the date of purchase. Upon the return of defective product or component prior to the expiration of the warranty period, Auralex will, at its option, repair the defective product or component or replace it with a comparable product or component. For more information, go to our Support tab at the top and select Warranty.


StopGap™ Sealant is a highly elastic, water-based sealant used for reducing sound transmission at the perimeter of wall systems, or around electrical box cutouts to achieve specified STC/MTC values. The surface dries to a tough film, but the sealant remains flexible and stays pliable for up to 5 times longer than alternative brands. Unlike other products, StopGap™ has no residual run-off. StopGap™ is paintable (dries white) and non-staining, and meets ASTM E-84 standards for flame retardancy.

StopGap™ comes in a large, 28 oz. caulking tube and therefore requires a larger than normal-sized caulking gun, which can be purchased at any local hardware store.

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  • Auralex® StopGap™ will achieve a Sound Transmission Class (STC) of 53 when applying it in accordance with ASTM C-919 “Standard Practice for use of Sealants in Acoustical Applications”. To achieve the 53 STC, StopGap™ should be applied as two beads of sealant at the top, bottom and all perimeter edges.
  • Coverage per 28 oz. cartridge is approximately ~32 linear ft. with a 3/8 inch bead applied.

California residents see Prop 65 WARNINGS

Construction Spec Sheet