Auralex StopGap Acoustical Sealant

$ 21.99
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Auralex StopGap Acoustical 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. And unlike other products, Stop-Gap has no residual run-off. StopGap is paintable and nonstaining, and meets ASTM C-834 standards for flame retardancy (flame spread=0; smoke developed=0).

Suggested Applications:

  • Apply in a 1/4" (6mm) bead around perimeter of sound related partition
  • Apply to depth as required for voids and larger openings
  • Seal sound-rated partitions on both sides where facings abut dissimilar materials
  • Apply to all openings formed for outlets and lights and completely cover the outside of electrical boxes

Auralex 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.


  • Highly elastic, water-based sealant
  • Reduce sound transmission at the perimeter of wall systems or electrical box cutouts to achieve STC/MTC
  • Surface dries to tough film
  • No residual run-off
  • Paintable and non-staining
  • Use in walls, ceilings or floors
  • Most effective when combined with other soundproofing constuction
  • Helps in decoupling floors and walls
  • Maintains STC of Wall System; will achieve an STC rating of 53 when applied per ASTM C-919
  • Permanently Flexible
  • Class A Per ASTM E84 for flame retardancy 
  • Coverage per 28 oz. cartridge is approximately ~32 linear ft. with a 3/8 inch bead applied


    • 1 Tube - Auralex StopGap Acoustical Sealant 


    • Treatment Type: Construction/Insulation
    • Manufacturer Part No.: STOPGAP

    Please Note: Auralex StopGap Acoustical Sealant is considered Consumer Commodity ORM-D and is not air shippable.