FlexSeal Caulk Grade Sealant


FlexSeal Caulk Grade Sealant is a white solvent-based synthetic elastomeric sealant. FlexSeal is extremely flexible and durable, but with a higher viscosity formulation than Standard FlexSeal. Like all solvent-based products, the surface must be clean, completely free of moisture and residual contaminants before application. FlexSeal Caulk Grade Sealant is especially suited for use in any application where caulk is typically used.


FlexSeal Caulk Grade Sealant is designed for use on metal, copper, concrete, wood, asphalt shingles, SBS, APP, EPDM, BUR, TPO and PVC substrates. Especially designed for use where elastomeric caulks are required; like term bar applications, or around clamping rings at penetrations. FlexSeal Caulk Grade Sealant may be used for cold weather applications provided that the material is stored properly and the substrate is dry prior to application.

Sizes Available

  • 11 oz tube


  • Extremely flexible and durable
  • Ideal for termination bar, railing, step flashings, or edge metal
  • Durable and UV resistant; will not chalk, crack or peel
  • Joint movement capability maximum ± 25%
  • Bonds to multiple substrates including; metal, copper, concrete, wood, asphalt shingles, SBS, APP, EPDM, BUR, TPO, and PVC.
  • Paintable

Physical Properties

Application Rate
Approximately 1/4 -3/8 inch (6 – 10 mm) bead
Application Method
Caulk Gun
Application Temp (air, surface)
32°F - 120°F (0°C – 48.9°C)
Drying Time (75°F, 50% RH)
24 – 48 hrs; Skins in less than 1 hour; Full Cure - approx. 48 hours
Total Solids (by weight)
77% ± 2%
Specific Gravity
1.24 ± 0.1
Weight per Gallon
10.3 ± 0.5 lbs
Viscosity (75°F)
1,200,000 cps ± 10%
Tensile Strength
>250 psi (>1.72 N/sq mm)


All documents are U.S. English unless otherwise noted

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