Elastomeric Roofing - TOPCOAT Flexseal

TOPCOAT® FlexSeal Sealant


TOPCOAT® FlexSeal is a white solvent-based synthetic elastomeric sealant. FlexSeal is extremely flexible and durable. Like all solvent-based products, the surface must be completely free of moisture before application.


FlexSeal is designed for use on metal, concrete, wood, copper, SBS, APP, EPDM, and BUR substrates.

FlexSeal is a universal sealant and can be used in multiply applications. Use the regular “self-leveling grade to line gutters and seal seams on metal roofs. This grade can also be used with GAF Flashing Fabric on penetrations, curbs and seams.

Use the caulk grade for sealing termination bars, skylights, clamping rings, penetrations and edge metal. Can be used for cold weather application. This product is easiest to apply at temperatures above 32°F. Substrate temperatures must be below 120°F when applying product.

  • Extremely flexible and durable

  • Durable and UV resistant; will not chalk, crack or peel

  • Guarantees available for up to 20 years*

  • Regular Grade is available in 1-gallon, 5-gallon, and 55-gallon containers
  • Caulk Grade is available in 10 oz. cartridges

For application questions, please contact GAF Contractor Services at

*See warranties and guarantees for complete coverage and restrictions

Technical Data FlexSeal Sealant FlexSeal Caulk Grade Sealant
Application Rate: 5 gallons/125@6” Approximately ¼ - 3/8 inch (6-10mm) bead
Application Method: Trowel or stiff bristle brush Caulk Gun
Application Temp (air, surface): 32°F – 120°F(0°C- 48.9°C) 32°F – 120°F (0°C- 48.9°C)
Drying Time (75°F, 50% RH): Approximately 24 hours 24- 48hrs; Skins in less than 1 hour; Full Cure- approx. 48 hours.
Recommended Wet Mil Thickness:  85 wet mils -
Recommended Dry Mil Thickness: 50 dry mils -
Total Solids (by weight): 77% ± 2% 77% ± 2%
Total Solids (by volume): 66% ± 2% -
Specific Gravity: 1.24 ± 0.1 1.24 ± 0.1
Weight per Gallon: 10.3 ± 0.5 lbs 10.3 ± 0.5 lbs
Viscosity (75°F): 600,000 ± 100,000 cps 1,200,000 cps ± 10%
LV - Viscosity (75°F): 150,000 ± 15,000 cps -
Tensile Strength: 485 psi ± 10% >250 psi (>1.72 N/sq mm)


All documents are U.S. English unless otherwise noted

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