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.
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|
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