Elastomeric Roofing - TOPCOAT Sky-Lite



TOPCOAT® Sky-Lite is a clear, solvent-based synthetic rubber sealer designed to protect and waterproof porous, deteriorated fiberglass reinforced skylight panels. It is offered in a water-based version when flammability and VOC content are a concern.


TOPCOAT® Sky-Lite is specially designed to seal and rebind fiberglass mat or fiber used in the construction of skylight panels in addition to weathered plastic skylights. Sky-Lite protects and reconditions translucent fiberglass skylight panels found on roofs and walls. DO NOT use to repair cracked or broken skylight panels. DO NOT apply at temperatures below 42°F. Substrate temperatures must be below 120°F when applying product.

  • Helps to seal out water and prevents leaking of porous skylight perimeters

  • Seals and binds reinforcing fibers and extends the life of the skylight panels

  • Reconditions leaky panels

  • Assists in the system of original skylight clarity

  • Limited material warranty available for up to 10 years*

  • Available in 5-gallon pails

For application questions, please contact GAF Contractor Services at

Applicable Standards

ASTM D-21-96, ASTM D-1475, ASTM E-1644

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

*See warranties for complete coverage and restrictions

TOPCOAT® Sky-Lite Technical Data
Application Rate: 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 1 hour per coat
Wet Mil Thickness: (1.0 Gallon/100SF) – 16 wet mils
Dry Mil Thickness: (1.0 Gallon/100SF) – 6 dry mils
Total Solids (by weight): 40.2% ± 2%
Total Solids (by volume): 35% ± 2%
Specific Gravity: 0.91 ± 0.1
Weight per Gallon: 7.6 ± 0.5 lbs
Viscosity (75°F): 3,000 ± 400 cps
Storage: Store in well-ventilated area at 50°F to 80°F; protect from freezing
Shelf Life: 1 Year
Clean-up: Mineral Spirits, Toluene, Xylene


All documents are U.S. English unless otherwise noted

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