Elastomeric Roofing - TOPCOAT Flashing Grade

TOPCOAT® Flashing - Brush Grade WOB


TOPCOAT® Flashing - Brush Grade WOB is a light gray, water-based 100% acrylic, synthetic rubber sealant that is applied to seams, fasteners, flashings, and penetrations prior to the application of the TOPCOAT® Membrane. Like the TOPCOAT® Membrane, it has superior adhesion, flexibility, and resistance to ultraviolet degradation.


TOPCOAT® Flashing - Brush Grade WOB is designed for use on metal, wood, and concrete. Provides a seal along seams and around fasteners on metal roofs and excellent sealing around curbs and counter flashings. Do not apply at temperatures below 42°F. Substrate temperatures must be below 120°F when applying product.

  • A synthetic rubber sealant that cures in the ultraviolet rays of the sun

  • Water-based; environmentally friendly and safe

  • Strong; forms a flexible seal that will not become brittle

  • Can be used in conjunction with TOPESTER Fabric to provide a superior seam

  • Flexible; will expand and contract with metal roof

  • Free from plasticizers and oils that will migrate out over time

  • Required for joints, seams, penetrations, and fastener heads

  • Limited material warranty available for up to 10 years*

  • Guarantees available for up to 20 years**

  • Available in 1-gallon, 5-gallon, 55-gallon containers, and 1-quart cartridges

For application questions, please contact GAF Contractor Services at

Applicable Standards

ASTM D-412, ASTM G-21, ASTM D-21-96, ASTM D-1475, ASTM E-1644,
and FTMS 141.6271

Note: Repair leaks promptly to avoid adverse effects, including mold growth

* See warranties and guarantees for complete coverage and restrictions
** When used as part of a multi-ply system

TOPCOAT® Flashing Brush Grade WOB Technical Data
Application Rate: 5 gallons/125 lineal ft. of seam (6” width)
Application Method: Brush or caulking gun
Application Temp (air, surface): 42° - 120°F
Drying Time (75°F, 50% RH): Approximately 24 hours
Recommended Wet Mil Thickness: 105 wet mils
Recommended Dry Mil Thickness: 60 dry mils
Total Solids (by weight): 68% ± 1%
Total Solids (by volume): 56% ± 2%
Specific Gravity: 1.44 ± 0.1
Weight per Gallon: 12.0 ± 0.5 lbs
Viscosity (75°F): 225,000 ± 22,500 cps
Tensile: 225 psi ± 10%
Storage: Store in well-ventilated area at 50°F to 80°F; protect from freezing
Shelf Life: 1 Year
Clean-up: Water before curing


All documents are U.S. English unless otherwise noted

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