POLYGUARD Blue Barrier Liquid Flashing 20oz Sausage & Gap Filler

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Polyguard BBLF is an all-purpose, fluid-applied flashing installed with an application gun and trowel used to create a weather-resistant, fully adhered air barrier system around window and door installations. It was developed utilizing Silyl Terminated Polyether Technology (STPE). It comes in a 20oz “sausage tube” requiring a “sausage gun” to apply. Can be left exposed to UV light for up to 9 months.

  • Creates an air-tight seal that resists harsh elements. Permanently flashes and seals around building penetrations.
  • Superior adhesion to concrete, metal, CMU block, untreated OSB or plywood sheathings, gypsum, and ICF.
  • Shore A Hardness of 55-65 with Tensile Strength of 300-350 PSI, Elongation of 200-250%, and 100% solids content.
  • Bonds to multiple substrates in either wet or dry conditions. Tack-free in 30-45 minutes. Cures in 8+ hours depending on conditions.
  • Complies with ASTM E84, AAMA 714-715, and NFPA 285 under many wall assemblies. Application ambient and surface temperature range of 40-100°F.


Polyguard BBGF is a structural adhesive and detail sealant used to fill voids and seams and to bond dissimilar materials. Typically Gap Filler is used to prep surfaces prior to the application of other Blue Barrier products for Window and Door Flashings and Air Barriers. Gap Filler was developed utilizing Silyl Terminated Polyether (STPE) Technology.