Elastomeric Roofing - TOPCOAT Precote

TOPCOAT® Precote


TOPCOAT® Precote is a clear, solvent-based thermoplastic liquid to be applied as the primer/sealer coat on any areas of corrugated asbestos (Transite) panels. It is extremely flexible and durable. Like all solvent-based products, the surface must be completely free of moisture before application.


TOPCOAT® Precote is a required step for treatment of corrugated asbestos panels providing optimum adhesion of TOPCOAT® Membrane. After application of TOPCOAT® Precote, the surface will be slightly tacky and will provide an excellent base for the application of TOPCOAT® Elastomeric Roofing Membrane. Do not apply at temperatures below 42°F. Substrate temperatures must be below 120°F when applying product.

  • Excellent primer and sealer for all areas of Transite panels

  • Used to bind loose and friable surfaces

  • Will leave the roof surface “tacky” and ready to provide a solid substrate for adhesion of TOPCOAT® Membrane

For application questions, please contact GAF Contractor Services at

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

TOPCOAT® Precote Technical Data
Application Rate: 0.75 to 1 gallon/100 sq. ft. per coat
Application Method: Roller or brush
Application Temp (air, surface): 42°F – 120°F
Drying Time (75°F, 50% RH): Approximately 30 minutes
Wet Mil Thickness: 12-16 (0.012" - 0.016")
Dry Mil Thickness: 3-4 (0.003" - 0.004")
Total Solids (by weight): 28.4% ± 1%
Total Solids (by volume): 24% ± 1%
Specific Gravity: 0.86 g/cc
Weight per Gallon: 7.2 ± 0.5 lbs
Viscosity (75°F): 200 ± 100 cps
Tensile Strength: 100 psi
Storage: Store in well-ventilated area at 50°F to 80°F; protect from freezing
Shelf Life: 1 Year
Clean-up: Xylene, Toluene

Note: Follow all EPA regulations concerning asbestos

Be sure to consult the TOPCOAT® Roof System Solutions Specifications Manual for more detailed information.


All documents are U.S. English unless otherwise noted

Commercial Roofing EagleView Commercial Property Owners Portal Architects And Specifiers Green Roof Central


Product Princing and Where to Buy
© Copyright 2018 GAF | Privacy Policy and Legal | GAF Canada | GAF U.S.